[syzbot] [f2fs?] KASAN: use-after-free Read in f2fs_lookup_rb_tree_ret

From: syzbot
Date: Mon Feb 20 2023 - 01:53:54 EST

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Hello,

syzbot found the following issue on:

HEAD commit: e1c04510f521 Merge tag 'pm-6.2-rc9' of git://git.kernel.or..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13833880c80000
kernel config: https://syzkaller.appspot.com/x/.config?x=ed360bed0f6dd86a
dashboard link: https://syzkaller.appspot.com/bug?extid=be5d4a7d1df4ced1c53c
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

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+be5d4a7d1df4ced1c53c@xxxxxxxxxxxxxxxxxxxxxxxxx

loop0: rw=1048577, sector=79920, nr_sectors = 2000 limit=40427
kworker/u17:1: attempt to access beyond end of device
loop0: rw=1048577, sector=49152, nr_sectors = 4096 limit=40427
==================================================================
BUG: KASAN: use-after-free in f2fs_lookup_rb_tree_ret+0x70e/0x750 fs/f2fs/extent_cache.c:268
Read of size 8 at addr ffff888048193118 by task kworker/u17:1/15

CPU: 2 PID: 15 Comm: kworker/u17:1 Not tainted 6.2.0-rc8-syzkaller-00021-ge1c04510f521 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: writeback wb_workfn (flush-7:0)
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:306 [inline]
print_report+0x15e/0x461 mm/kasan/report.c:417
kasan_report+0xbf/0x1f0 mm/kasan/report.c:517
f2fs_lookup_rb_tree_ret+0x70e/0x750 fs/f2fs/extent_cache.c:268
__update_extent_tree_range+0x322/0x1740 fs/f2fs/extent_cache.c:712
__update_extent_cache+0x588/0x740 fs/f2fs/extent_cache.c:962
f2fs_outplace_write_data+0x1eb/0x280 fs/f2fs/segment.c:3453
f2fs_do_write_data_page+0x9c7/0x1e20 fs/f2fs/data.c:2745
f2fs_write_single_data_page+0x13f0/0x1920 fs/f2fs/data.c:2863
f2fs_write_cache_pages+0xaa8/0x2010 fs/f2fs/data.c:3115
__f2fs_write_data_pages fs/f2fs/data.c:3265 [inline]
f2fs_write_data_pages+0xca8/0x1230 fs/f2fs/data.c:3292
do_writepages+0x1af/0x690 mm/page-writeback.c:2581
__writeback_single_inode+0x159/0x1440 fs/fs-writeback.c:1598
writeback_sb_inodes+0x54d/0xf90 fs/fs-writeback.c:1889
__writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1960
wb_writeback+0x8d6/0xd70 fs/fs-writeback.c:2065
wb_check_background_flush fs/fs-writeback.c:2131 [inline]
wb_do_writeback fs/fs-writeback.c:2219 [inline]
wb_workfn+0xa16/0x12f0 fs/fs-writeback.c:2246
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x669/0x1090 kernel/workqueue.c:2436
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>

Allocated by task 5258:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
__kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slab.h:761 [inline]
slab_alloc_node mm/slab.c:3263 [inline]
slab_alloc mm/slab.c:3272 [inline]
__kmem_cache_alloc_lru mm/slab.c:3449 [inline]
kmem_cache_alloc+0x225/0x460 mm/slab.c:3458
f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2796 [inline]
f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2806 [inline]
__grab_extent_tree+0x278/0x5a0 fs/f2fs/extent_cache.c:423
f2fs_init_extent_tree+0x57/0x80 fs/f2fs/extent_cache.c:533
f2fs_new_inode+0xdfa/0x2760 fs/f2fs/namei.c:312
__f2fs_tmpfile+0xba/0x440 fs/f2fs/namei.c:852
f2fs_ioc_start_atomic_write+0x409/0x1260 fs/f2fs/file.c:2098
__f2fs_ioctl+0x3f2a/0xaaf0 fs/f2fs/file.c:4150
f2fs_ioctl+0x18e/0x220 fs/f2fs/file.c:4242
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 5258:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:523
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x13b/0x1a0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:177 [inline]
__cache_free mm/slab.c:3396 [inline]
__do_kmem_cache_free mm/slab.c:3582 [inline]
kmem_cache_free mm/slab.c:3607 [inline]
kmem_cache_free+0x108/0x4c0 mm/slab.c:3600
__destroy_extent_tree+0x1f8/0x7f0 fs/f2fs/extent_cache.c:1193
f2fs_destroy_extent_tree+0x17/0x30 fs/f2fs/extent_cache.c:1204
f2fs_evict_inode+0x38b/0x1df0 fs/f2fs/inode.c:789
evict+0x2ed/0x6b0 fs/inode.c:664
iput_final fs/inode.c:1747 [inline]
iput.part.0+0x59b/0x880 fs/inode.c:1773
iput+0x5c/0x80 fs/inode.c:1763
f2fs_abort_atomic_write+0xea/0x4f0 fs/f2fs/segment.c:196
f2fs_release_file+0xc8/0xf0 fs/f2fs/file.c:1869
__fput+0x27c/0xa90 fs/file_table.c:320
task_work_run+0x16f/0x270 kernel/task_work.c:179
get_signal+0x1c7/0x2450 kernel/signal.c:2635
arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888048193110
which belongs to the cache f2fs_extent_tree of size 144
The buggy address is located 8 bytes inside of
144-byte region [ffff888048193110, ffff8880481931a0)

The buggy address belongs to the physical page:
page:ffffea00012064c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888048193ee0 pfn:0x48193
flags: 0x4fff00000000200(slab|node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff00000000200 ffff888043be9e00 ffff888043c15d40 ffff888043c15d40
raw: ffff888048193ee0 ffff888048193040 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x140c50(GFP_NOFS|__GFP_COMP|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 5258, tgid 5254 (syz-executor.0), ts 231438117054, free_ts 231023552910
prep_new_page mm/page_alloc.c:2531 [inline]
get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283
__alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5549
__alloc_pages_node include/linux/gfp.h:237 [inline]
kmem_getpages mm/slab.c:1363 [inline]
cache_grow_begin+0x94/0x390 mm/slab.c:2576
fallback_alloc+0x1e2/0x2d0 mm/slab.c:3119
__do_cache_alloc mm/slab.c:3223 [inline]
slab_alloc_node mm/slab.c:3256 [inline]
slab_alloc mm/slab.c:3272 [inline]
__kmem_cache_alloc_lru mm/slab.c:3449 [inline]
kmem_cache_alloc+0x302/0x460 mm/slab.c:3458
f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2796 [inline]
f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2806 [inline]
__grab_extent_tree+0x278/0x5a0 fs/f2fs/extent_cache.c:423
f2fs_init_extent_tree+0x57/0x80 fs/f2fs/extent_cache.c:533
f2fs_new_inode+0xdfa/0x2760 fs/f2fs/namei.c:312
f2fs_create+0x1db/0x670 fs/f2fs/namei.c:353
lookup_open.isra.0+0xee7/0x1270 fs/namei.c:3413
open_last_lookups fs/namei.c:3481 [inline]
path_openat+0x975/0x2a50 fs/namei.c:3711
do_filp_open+0x1ba/0x410 fs/namei.c:3741
do_sys_openat2+0x16d/0x4c0 fs/open.c:1310
do_sys_open fs/open.c:1326 [inline]
__do_sys_openat fs/open.c:1342 [inline]
__se_sys_openat fs/open.c:1337 [inline]
__x64_sys_openat+0x143/0x1f0 fs/open.c:1337
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1446 [inline]
free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1496
free_unref_page_prepare mm/page_alloc.c:3369 [inline]
free_unref_page+0x1d/0x490 mm/page_alloc.c:3464
slab_destroy mm/slab.c:1619 [inline]
slabs_destroy+0x85/0xc0 mm/slab.c:1639
__cache_free_alien mm/slab.c:774 [inline]
cache_free_alien mm/slab.c:790 [inline]
___cache_free+0x204/0x3d0 mm/slab.c:3423
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x4f/0x1a0 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slab.h:761 [inline]
slab_alloc_node mm/slab.c:3263 [inline]
slab_alloc mm/slab.c:3272 [inline]
__kmem_cache_alloc_lru mm/slab.c:3449 [inline]
kmem_cache_alloc+0x225/0x460 mm/slab.c:3458
getname_flags.part.0+0x50/0x4f0 fs/namei.c:139
getname_flags+0x9e/0xe0 include/linux/audit.h:320
user_path_at_empty+0x2f/0x60 fs/namei.c:2875
user_path_at include/linux/namei.h:57 [inline]
ksys_umount fs/namespace.c:1927 [inline]
__do_sys_umount fs/namespace.c:1935 [inline]
__se_sys_umount fs/namespace.c:1933 [inline]
__x64_sys_umount+0xfc/0x190 fs/namespace.c:1933
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
ffff888048193000: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
ffff888048193080: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
>ffff888048193100: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888048193180: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
ffff888048193200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

---
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