Re: [syzbot] memory leak in vfs_tmpfile_open

From: Miklos Szeredi
Date: Thu Oct 13 2022 - 04:29:08 EST

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#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
master

On Thu, 13 Oct 2022 at 10:05, syzbot
<syzbot+fd749a7ea127a84e0ffd@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 49da07006239 Merge tag 'memblock-v6.1-rc1' of git://git.ke..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=12fea734880000
> kernel config: https://syzkaller.appspot.com/x/.config?x=8a068149f16da5bd
> dashboard link: https://syzkaller.appspot.com/bug?extid=fd749a7ea127a84e0ffd
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14dfc1a4880000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=123af8aa880000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/827598b3022b/disk-49da0700.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/a6e5b024841f/vmlinux-49da0700.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+fd749a7ea127a84e0ffd@xxxxxxxxxxxxxxxxxxxxxxxxx
>
> BUG: memory leak
> unreferenced object 0xffff888105a4b500 (size 256):
> comm "syz-executor426", pid 3643, jiffies 4294961352 (age 23.770s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> a0 04 7d 07 81 88 ff ff 00 8f b0 0e 81 88 ff ff ..}.............
> backtrace:
> [<ffffffff815dbadf>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
> [<ffffffff815dbadf>] __alloc_file+0x1f/0xf0 fs/file_table.c:138
> [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
> [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
> [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
> [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
> [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
> [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
> [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
> [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
> [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
> [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
> [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
> [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
> [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
> [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
> [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
> [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff8881024495a0 (size 24):
> comm "syz-executor426", pid 3643, jiffies 4294961352 (age 23.770s)
> hex dump (first 24 bytes):
> 00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff ................
> 00 00 00 00 00 00 00 00 ........
> backtrace:
> [<ffffffff82222e7a>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
> [<ffffffff82222e7a>] lsm_file_alloc security/security.c:575 [inline]
> [<ffffffff82222e7a>] security_file_alloc+0x2a/0xb0 security/security.c:1529
> [<ffffffff815dbb1d>] __alloc_file+0x5d/0xf0 fs/file_table.c:143
> [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
> [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
> [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
> [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
> [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
> [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
> [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
> [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
> [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
> [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
> [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
> [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
> [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
> [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
> [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
> [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105b4b900 (size 176):
> comm "syz-executor426", pid 3645, jiffies 4294961353 (age 23.760s)
> hex dump (first 32 bytes):
> 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff81283347>] prepare_creds+0x27/0x470 kernel/cred.c:260
> [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
> [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
> [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
> [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
> [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
> [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
> [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
> [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
> [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
> [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888100c4bb80 (size 32):
> comm "syz-executor426", pid 3645, jiffies 4294961353 (age 23.760s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff814ce961>] __do_kmalloc_node mm/slab_common.c:954 [inline]
> [<ffffffff814ce961>] __kmalloc+0x41/0x130 mm/slab_common.c:968
> [<ffffffff82223655>] kmalloc include/linux/slab.h:581 [inline]
> [<ffffffff82223655>] kzalloc include/linux/slab.h:712 [inline]
> [<ffffffff82223655>] lsm_cred_alloc security/security.c:540 [inline]
> [<ffffffff82223655>] security_prepare_creds+0xa5/0xd0 security/security.c:1705
> [<ffffffff81283606>] prepare_creds+0x2e6/0x470 kernel/cred.c:291
> [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
> [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
> [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
> [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
> [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
> [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
> [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
> [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
> [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
> [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105a4b500 (size 256):
> comm "syz-executor426", pid 3643, jiffies 4294961352 (age 25.050s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> a0 04 7d 07 81 88 ff ff 00 8f b0 0e 81 88 ff ff ..}.............
> backtrace:
> [<ffffffff815dbadf>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
> [<ffffffff815dbadf>] __alloc_file+0x1f/0xf0 fs/file_table.c:138
> [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
> [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
> [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
> [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
> [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
> [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
> [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
> [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
> [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
> [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
> [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
> [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
> [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
> [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
> [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
> [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff8881024495a0 (size 24):
> comm "syz-executor426", pid 3643, jiffies 4294961352 (age 25.050s)
> hex dump (first 24 bytes):
> 00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff ................
> 00 00 00 00 00 00 00 00 ........
> backtrace:
> [<ffffffff82222e7a>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
> [<ffffffff82222e7a>] lsm_file_alloc security/security.c:575 [inline]
> [<ffffffff82222e7a>] security_file_alloc+0x2a/0xb0 security/security.c:1529
> [<ffffffff815dbb1d>] __alloc_file+0x5d/0xf0 fs/file_table.c:143
> [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
> [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
> [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
> [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
> [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
> [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
> [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
> [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
> [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
> [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
> [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
> [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
> [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
> [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
> [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
> [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105b4b900 (size 176):
> comm "syz-executor426", pid 3645, jiffies 4294961353 (age 25.040s)
> hex dump (first 32 bytes):
> 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff81283347>] prepare_creds+0x27/0x470 kernel/cred.c:260
> [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
> [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
> [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
> [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
> [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
> [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
> [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
> [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
> [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
> [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888100c4bb80 (size 32):
> comm "syz-executor426", pid 3645, jiffies 4294961353 (age 25.040s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff814ce961>] __do_kmalloc_node mm/slab_common.c:954 [inline]
> [<ffffffff814ce961>] __kmalloc+0x41/0x130 mm/slab_common.c:968
> [<ffffffff82223655>] kmalloc include/linux/slab.h:581 [inline]
> [<ffffffff82223655>] kzalloc include/linux/slab.h:712 [inline]
> [<ffffffff82223655>] lsm_cred_alloc security/security.c:540 [inline]
> [<ffffffff82223655>] security_prepare_creds+0xa5/0xd0 security/security.c:1705
> [<ffffffff81283606>] prepare_creds+0x2e6/0x470 kernel/cred.c:291
> [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
> [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
> [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
> [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
> [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
> [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
> [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
> [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
> [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
> [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105a4b500 (size 256):
> comm "syz-executor426", pid 3643, jiffies 4294961352 (age 26.330s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> a0 04 7d 07 81 88 ff ff 00 8f b0 0e 81 88 ff ff ..}.............
> backtrace:
> [<ffffffff815dbadf>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
> [<ffffffff815dbadf>] __alloc_file+0x1f/0xf0 fs/file_table.c:138
> [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
> [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
> [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
> [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
> [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
> [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
> [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
> [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
> [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
> [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
> [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
> [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
> [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
> [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
> [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
> [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff8881024495a0 (size 24):
> comm "syz-executor426", pid 3643, jiffies 4294961352 (age 26.330s)
> hex dump (first 24 bytes):
> 00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff ................
> 00 00 00 00 00 00 00 00 ........
> backtrace:
> [<ffffffff82222e7a>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
> [<ffffffff82222e7a>] lsm_file_alloc security/security.c:575 [inline]
> [<ffffffff82222e7a>] security_file_alloc+0x2a/0xb0 security/security.c:1529
> [<ffffffff815dbb1d>] __alloc_file+0x5d/0xf0 fs/file_table.c:143
> [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
> [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
> [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
> [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
> [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
> [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
> [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
> [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
> [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
> [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
> [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
> [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
> [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
> [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
> [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
> [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105b4b900 (size 176):
> comm "syz-executor426", pid 3645, jiffies 4294961353 (age 26.320s)
> hex dump (first 32 bytes):
> 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff81283347>] prepare_creds+0x27/0x470 kernel/cred.c:260
> [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
> [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
> [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
> [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
> [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
> [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
> [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
> [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
> [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
> [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888100c4bb80 (size 32):
> comm "syz-executor426", pid 3645, jiffies 4294961353 (age 26.320s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff814ce961>] __do_kmalloc_node mm/slab_common.c:954 [inline]
> [<ffffffff814ce961>] __kmalloc+0x41/0x130 mm/slab_common.c:968
> [<ffffffff82223655>] kmalloc include/linux/slab.h:581 [inline]
> [<ffffffff82223655>] kzalloc include/linux/slab.h:712 [inline]
> [<ffffffff82223655>] lsm_cred_alloc security/security.c:540 [inline]
> [<ffffffff82223655>] security_prepare_creds+0xa5/0xd0 security/security.c:1705
> [<ffffffff81283606>] prepare_creds+0x2e6/0x470 kernel/cred.c:291
> [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
> [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
> [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
> [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
> [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
> [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
> [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
> [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
> [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
> [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105a4b500 (size 256):
> comm "syz-executor426", pid 3643, jiffies 4294961352 (age 27.580s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> a0 04 7d 07 81 88 ff ff 00 8f b0 0e 81 88 ff ff ..}.............
> backtrace:
> [<ffffffff815dbadf>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
> [<ffffffff815dbadf>] __alloc_file+0x1f/0xf0 fs/file_table.c:138
> [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
> [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
> [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
> [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
> [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
> [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
> [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
> [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
> [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
> [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
> [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
> [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
> [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
> [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
> [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
> [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff8881024495a0 (size 24):
> comm "syz-executor426", pid 3643, jiffies 4294961352 (age 27.580s)
> hex dump (first 24 bytes):
> 00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff ................
> 00 00 00 00 00 00 00 00 ........
> backtrace:
> [<ffffffff82222e7a>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
> [<ffffffff82222e7a>] lsm_file_alloc security/security.c:575 [inline]
> [<ffffffff82222e7a>] security_file_alloc+0x2a/0xb0 security/security.c:1529
> [<ffffffff815dbb1d>] __alloc_file+0x5d/0xf0 fs/file_table.c:143
> [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
> [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
> [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
> [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
> [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
> [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
> [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
> [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
> [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
> [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
> [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
> [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
> [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
> [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
> [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
> [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105b4b900 (size 176):
> comm "syz-executor426", pid 3645, jiffies 4294961353 (age 27.570s)
> hex dump (first 32 bytes):
> 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff81283347>] prepare_creds+0x27/0x470 kernel/cred.c:260
> [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
> [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
> [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
> [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
> [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
> [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
> [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
> [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
> [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
> [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888100c4bb80 (size 32):
> comm "syz-executor426", pid 3645, jiffies 4294961353 (age 27.570s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff814ce961>] __do_kmalloc_node mm/slab_common.c:954 [inline]
> [<ffffffff814ce961>] __kmalloc+0x41/0x130 mm/slab_common.c:968
> [<ffffffff82223655>] kmalloc include/linux/slab.h:581 [inline]
> [<ffffffff82223655>] kzalloc include/linux/slab.h:712 [inline]
> [<ffffffff82223655>] lsm_cred_alloc security/security.c:540 [inline]
> [<ffffffff82223655>] security_prepare_creds+0xa5/0xd0 security/security.c:1705
> [<ffffffff81283606>] prepare_creds+0x2e6/0x470 kernel/cred.c:291
> [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
> [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
> [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
> [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
> [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
> [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
> [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
> [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
> [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
> [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105a4b500 (size 256):
> comm "syz-executor426", pid 3643, jiffies 4294961352 (age 31.460s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> a0 04 7d 07 81 88 ff ff 00 8f b0 0e 81 88 ff ff ..}.............
> backtrace:
> [<ffffffff815dbadf>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
> [<ffffffff815dbadf>] __alloc_file+0x1f/0xf0 fs/file_table.c:138
> [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
> [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
> [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
> [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
> [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
> [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
> [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
> [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
> [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
> [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
> [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
> [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
> [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
> [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
> [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
> [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff8881024495a0 (size 24):
> comm "syz-executor426", pid 3643, jiffies 4294961352 (age 31.460s)
> hex dump (first 24 bytes):
> 00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff ................
> 00 00 00 00 00 00 00 00 ........
> backtrace:
> [<ffffffff82222e7a>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
> [<ffffffff82222e7a>] lsm_file_alloc security/security.c:575 [inline]
> [<ffffffff82222e7a>] security_file_alloc+0x2a/0xb0 security/security.c:1529
> [<ffffffff815dbb1d>] __alloc_file+0x5d/0xf0 fs/file_table.c:143
> [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
> [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
> [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
> [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
> [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
> [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
> [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
> [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
> [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
> [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
> [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
> [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
> [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
> [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
> [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
> [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105b4b900 (size 176):
> comm "syz-executor426", pid 3645, jiffies 4294961353 (age 31.450s)
> hex dump (first 32 bytes):
> 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff81283347>] prepare_creds+0x27/0x470 kernel/cred.c:260
> [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
> [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
> [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
> [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
> [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
> [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
> [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
> [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
> [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
> [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888100c4bb80 (size 32):
> comm "syz-executor426", pid 3645, jiffies 4294961353 (age 31.450s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff814ce961>] __do_kmalloc_node mm/slab_common.c:954 [inline]
> [<ffffffff814ce961>] __kmalloc+0x41/0x130 mm/slab_common.c:968
> [<ffffffff82223655>] kmalloc include/linux/slab.h:581 [inline]
> [<ffffffff82223655>] kzalloc include/linux/slab.h:712 [inline]
> [<ffffffff82223655>] lsm_cred_alloc security/security.c:540 [inline]
> [<ffffffff82223655>] security_prepare_creds+0xa5/0xd0 security/security.c:1705
> [<ffffffff81283606>] prepare_creds+0x2e6/0x470 kernel/cred.c:291
> [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
> [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
> [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
> [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
> [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
> [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
> [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
> [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
> [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
> [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105a4b500 (size 256):
> comm "syz-executor426", pid 3643, jiffies 4294961352 (age 31.490s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> a0 04 7d 07 81 88 ff ff 00 8f b0 0e 81 88 ff ff ..}.............
> backtrace:
> [<ffffffff815dbadf>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
> [<ffffffff815dbadf>] __alloc_file+0x1f/0xf0 fs/file_table.c:138
> [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
> [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
> [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
> [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
> [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
> [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
> [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
> [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
> [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
> [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
> [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
> [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
> [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
> [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
> [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
> [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff8881024495a0 (size 24):
> comm "syz-executor426", pid 3643, jiffies 4294961352 (age 31.490s)
> hex dump (first 24 bytes):
> 00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff ................
> 00 00 00 00 00 00 00 00 ........
> backtrace:
> [<ffffffff82222e7a>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
> [<ffffffff82222e7a>] lsm_file_alloc security/security.c:575 [inline]
> [<ffffffff82222e7a>] security_file_alloc+0x2a/0xb0 security/security.c:1529
> [<ffffffff815dbb1d>] __alloc_file+0x5d/0xf0 fs/file_table.c:143
> [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
> [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
> [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
> [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
> [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
> [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
> [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
> [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
> [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
> [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
> [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
> [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
> [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
> [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
> [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
> [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
> [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105b4b900 (size 176):
> comm "syz-executor426", pid 3645, jiffies 4294961353 (age 31.480s)
> hex dump (first 32 bytes):
> 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff81283347>] prepare_creds+0x27/0x470 kernel/cred.c:260
> [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
> [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
> [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
> [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
> [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
> [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
> [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
> [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
> [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
> [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888100c4bb80 (size 32):
> comm "syz-executor426", pid 3645, jiffies 4294961353 (age 31.480s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff814ce961>] __do_kmalloc_node mm/slab_common.c:954 [inline]
> [<ffffffff814ce961>] __kmalloc+0x41/0x130 mm/slab_common.c:968
> [<ffffffff82223655>] kmalloc include/linux/slab.h:581 [inline]
> [<ffffffff82223655>] kzalloc include/linux/slab.h:712 [inline]
> [<ffffffff82223655>] lsm_cred_alloc security/security.c:540 [inline]
> [<ffffffff82223655>] security_prepare_creds+0xa5/0xd0 security/security.c:1705
> [<ffffffff81283606>] prepare_creds+0x2e6/0x470 kernel/cred.c:291
> [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
> [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
> [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
> [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
> [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
> [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
> [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
> [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
> [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
> [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
> [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> executing program
> executing program
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches
From: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Subject: ovl: fix tmpfile leak

Missed an error cleanup.

Reported-by: syzbot+fd749a7ea127a84e0ffd@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 2b1a77461f16 ("ovl: use vfs_tmpfile_open() helper")
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
---
fs/overlayfs/copy_up.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -754,7 +754,7 @@ static int ovl_copy_up_tmpfile(struct ov
if (!c->metacopy && c->stat.size) {
err = ovl_copy_up_file(ofs, c->dentry, tmpfile, c->stat.size);
if (err)
- return err;
+ goto out_fput;
}

err = ovl_copy_up_metadata(c, temp);

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