KMSAN: uninit-value in udf_evict_inode

From: syzbot
Date: Fri Sep 25 2020 - 01:18:29 EST

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Hello,

syzbot found the following issue on:

HEAD commit: c5a13b33 kmsan: clang-format core
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=142cf809900000
kernel config: https://syzkaller.appspot.com/x/.config?x=20f149ad694ba4be
dashboard link: https://syzkaller.appspot.com/bug?extid=91f02b28f9bb5f5f1341
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+91f02b28f9bb5f5f1341@xxxxxxxxxxxxxxxxxxxxxxxxx

UDF-fs: warning (device loop3): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2020/09/19 18:44 (1000)
UDF-fs: error (device loop3): udf_read_inode: (ino 1328) failed !bh
=====================================================
BUG: KMSAN: uninit-value in udf_evict_inode+0x382/0x7d0 fs/udf/inode.c:150
CPU: 0 PID: 13956 Comm: syz-executor.3 Not tainted 5.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x21c/0x280 lib/dump_stack.c:118
kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:122
__msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:219
udf_evict_inode+0x382/0x7d0 fs/udf/inode.c:150
evict+0x4d3/0xec0 fs/inode.c:576
iput_final fs/inode.c:1652 [inline]
iput+0xc7b/0xf50 fs/inode.c:1678
iget_failed+0x2cb/0x390 fs/bad_inode.c:242
__udf_iget+0x111d/0x4650 fs/udf/inode.c:1914
udf_iget fs/udf/udfdecl.h:147 [inline]
udf_fill_super+0x2fa3/0x3330 fs/udf/super.c:2284
mount_bdev+0x622/0x910 fs/super.c:1417
udf_mount+0xc9/0xe0 fs/udf/super.c:127
legacy_get_tree+0x163/0x2e0 fs/fs_context.c:592
vfs_get_tree+0xd8/0x5d0 fs/super.c:1547
do_new_mount fs/namespace.c:2875 [inline]
path_mount+0x3d1a/0x5d40 fs/namespace.c:3192
do_mount+0x1c6/0x220 fs/namespace.c:3205
__do_compat_sys_mount fs/compat.c:122 [inline]
__se_compat_sys_mount+0x7b5/0xaa0 fs/compat.c:89
__ia32_compat_sys_mount+0x62/0x80 fs/compat.c:89
do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline]
__do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139
do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162
do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205
entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f94549
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f558df20 EFLAGS: 00000292 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00000000f558df7c RCX: 0000000020000100
RDX: 0000000020000000 RSI: 0000000000000000 RDI: 00000000f558dfbc
RBP: 00000000f558df7c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Uninit was stored to memory at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:143 [inline]
kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:311
__msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:169
udf_alloc_inode+0x2ab/0x2d0 fs/udf/super.c:154
alloc_inode fs/inode.c:232 [inline]
iget_locked+0x37a/0x13f0 fs/inode.c:1193
__udf_iget+0x152/0x4650 fs/udf/inode.c:1902
udf_iget fs/udf/udfdecl.h:147 [inline]
udf_fill_super+0x2fa3/0x3330 fs/udf/super.c:2284
mount_bdev+0x622/0x910 fs/super.c:1417
udf_mount+0xc9/0xe0 fs/udf/super.c:127
legacy_get_tree+0x163/0x2e0 fs/fs_context.c:592
vfs_get_tree+0xd8/0x5d0 fs/super.c:1547
do_new_mount fs/namespace.c:2875 [inline]
path_mount+0x3d1a/0x5d40 fs/namespace.c:3192
do_mount+0x1c6/0x220 fs/namespace.c:3205
__do_compat_sys_mount fs/compat.c:122 [inline]
__se_compat_sys_mount+0x7b5/0xaa0 fs/compat.c:89
__ia32_compat_sys_mount+0x62/0x80 fs/compat.c:89
do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline]
__do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139
do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162
do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205
entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was created at:
kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:143
kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:268 [inline]
kmsan_alloc_page+0xc5/0x1a0 mm/kmsan/kmsan_shadow.c:292
__alloc_pages_nodemask+0xf34/0x1120 mm/page_alloc.c:4927
alloc_pages_current+0x685/0xb50 mm/mempolicy.c:2275
alloc_pages include/linux/gfp.h:545 [inline]
alloc_slab_page mm/slub.c:1634 [inline]
allocate_slab+0x2fe/0x1180 mm/slub.c:1777
new_slab mm/slub.c:1838 [inline]
new_slab_objects mm/slub.c:2595 [inline]
___slab_alloc+0xd65/0x1940 mm/slub.c:2756
__slab_alloc mm/slub.c:2796 [inline]
slab_alloc_node mm/slub.c:2871 [inline]
slab_alloc mm/slub.c:2916 [inline]
kmem_cache_alloc+0x9fe/0xc80 mm/slub.c:2921
udf_alloc_inode+0x60/0x2d0 fs/udf/super.c:144
alloc_inode fs/inode.c:232 [inline]
iget_locked+0x37a/0x13f0 fs/inode.c:1193
__udf_iget+0x152/0x4650 fs/udf/inode.c:1902
udf_iget fs/udf/udfdecl.h:147 [inline]
udf_fill_super+0x2fa3/0x3330 fs/udf/super.c:2284
mount_bdev+0x622/0x910 fs/super.c:1417
udf_mount+0xc9/0xe0 fs/udf/super.c:127
legacy_get_tree+0x163/0x2e0 fs/fs_context.c:592
vfs_get_tree+0xd8/0x5d0 fs/super.c:1547
do_new_mount fs/namespace.c:2875 [inline]
path_mount+0x3d1a/0x5d40 fs/namespace.c:3192
do_mount+0x1c6/0x220 fs/namespace.c:3205
__do_compat_sys_mount fs/compat.c:122 [inline]
__se_compat_sys_mount+0x7b5/0xaa0 fs/compat.c:89
__ia32_compat_sys_mount+0x62/0x80 fs/compat.c:89
do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline]
__do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139
do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162
do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205
entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
=====================================================

---
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