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BUG: KASAN: use-after-free in crc_itu_t+0xce/0xe0 lib/crc-itu-t.c:60
Read of size 1 at addr ffff88806fc65000 by task syz-executor.0/3618

CPU: 1 PID: 3618 Comm: syz-executor.0 Not tainted 6.1.0-rc4-syzkaller-00362-gfef7fd48922d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:395
 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495
 crc_itu_t+0xce/0xe0 lib/crc-itu-t.c:60
 udf_finalize_lvid+0xe0/0x1d0 fs/udf/super.c:2021
 udf_sync_fs+0xe6/0x150 fs/udf/super.c:2377
 sync_filesystem.part.0+0x75/0x1d0 fs/sync.c:56
 sync_filesystem+0x8b/0xc0 fs/sync.c:43
 generic_shutdown_super+0x70/0x410 fs/super.c:474
 kill_block_super+0x97/0xf0 fs/super.c:1428
 deactivate_locked_super+0x94/0x160 fs/super.c:332
 deactivate_super+0xad/0xd0 fs/super.c:363
 cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1186
 task_work_run+0x16b/0x270 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:296
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f931308caa7
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe2e15aa58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f931308caa7
RDX: 00007ffe2e15ab2a RSI: 000000000000000a RDI: 00007ffe2e15ab20
RBP: 00007ffe2e15ab20 R08: 00000000ffffffff R09: 00007ffe2e15a8f0
R10: 00005555565a38b3 R11: 0000000000000246 R12: 00007f93130e5826
R13: 00007ffe2e15bbe0 R14: 00005555565a3810 R15: 00007ffe2e15bc20
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001bf1940 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x6fc65
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001baab88 ffffea0001c0c7c8 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 3698, tgid 3696 (syz-executor.0), ts 56838748097, free_ts 56942519569
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4288
 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5555
 __folio_alloc+0x12/0x40 mm/page_alloc.c:5587
 vma_alloc_folio+0xf9/0x780 mm/mempolicy.c:2246
 shmem_alloc_folio+0x107/0x1d0 mm/shmem.c:1561
 shmem_alloc_and_acct_folio+0x15e/0x5d0 mm/shmem.c:1585
 shmem_get_folio_gfp+0xb49/0x1a60 mm/shmem.c:1913
 shmem_get_folio mm/shmem.c:2044 [inline]
 shmem_write_begin+0x146/0x380 mm/shmem.c:2531
 generic_perform_write+0x252/0x570 mm/filemap.c:3753
 __generic_file_write_iter+0x2aa/0x4d0 mm/filemap.c:3881
 generic_file_write_iter+0xdf/0x350 mm/filemap.c:3913
 call_write_iter include/linux/fs.h:2191 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x9e9/0xdd0 fs/read_write.c:584
 ksys_write+0x127/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 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:1459 [inline]
 free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1509
 free_unref_page_prepare mm/page_alloc.c:3387 [inline]
 free_unref_page_list+0x172/0xc40 mm/page_alloc.c:3529
 release_pages+0xc86/0x1360 mm/swap.c:1055
 __pagevec_release+0x77/0x100 mm/swap.c:1075
 pagevec_release include/linux/pagevec.h:71 [inline]
 folio_batch_release include/linux/pagevec.h:135 [inline]
 shmem_undo_range+0x8eb/0x12a0 mm/shmem.c:946
 shmem_truncate_range mm/shmem.c:1034 [inline]
 shmem_evict_inode+0x3c6/0xc30 mm/shmem.c:1143
 evict+0x2ed/0x6b0 fs/inode.c:664
 iput_final fs/inode.c:1747 [inline]
 iput.part.0+0x59b/0x880 fs/inode.c:1773
 iput+0x58/0x70 fs/inode.c:1763
 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401
 __dentry_kill+0x3c0/0x640 fs/dcache.c:607
 dentry_kill fs/dcache.c:733 [inline]
 dput+0x806/0xdb0 fs/dcache.c:913
 __fput+0x3cc/0xa90 fs/file_table.c:328
 task_work_run+0x16b/0x270 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:296

Memory state around the buggy address:
 ffff88806fc64f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88806fc64f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88806fc65000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88806fc65080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806fc65100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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