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BUG: KASAN: use-after-free in crc_itu_t+0x1d5/0x2a0 lib/crc-itu-t.c:60
Read of size 1 at addr ffff8880213f6000 by task syz-executor.4/5109

CPU: 1 PID: 5109 Comm: syz-executor.4 Not tainted 6.7.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:475
 kasan_report+0x142/0x170 mm/kasan/report.c:588
 crc_itu_t+0x1d5/0x2a0 lib/crc-itu-t.c:60
 udf_finalize_lvid fs/udf/super.c:1984 [inline]
 udf_sync_fs+0x1d2/0x380 fs/udf/super.c:2340
 sync_filesystem+0xec/0x220 fs/sync.c:56
 generic_shutdown_super+0x72/0x2c0 fs/super.c:669
 kill_block_super+0x44/0x90 fs/super.c:1667
 deactivate_locked_super+0xc1/0x130 fs/super.c:484
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1256
 task_work_run+0x24a/0x300 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x150 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x69/0x2a0 kernel/entry/common.c:296
 do_syscall_64+0x52/0x110 arch/x86/entry/common.c:88
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f354407de17
Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 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 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffe3bc23ee8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f354407de17
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffe3bc23fa0
RBP: 00007ffe3bc23fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe3bc25060
R13: 00007f35440c73b9 R14: 000000000006dfb1 R15: 0000000000000013
 </TASK>

The buggy address belongs to the physical page:
page:ffffea000084fd80 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x213f6
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffff7f(buddy)
raw: 00fff00000000000 ffffea00009dd3c8 ffffea000093b888 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x141c40(GFP_NOFS|__GFP_COMP|__GFP_HARDWALL|__GFP_WRITE), pid 10627, tgid 10626 (syz-executor.4), ts 451384638736, free_ts 452749163457
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1544 [inline]
 get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3312
 __alloc_pages+0x255/0x680 mm/page_alloc.c:4568
 alloc_pages_mpol+0x3de/0x640 mm/mempolicy.c:2133
 alloc_pages mm/mempolicy.c:2204 [inline]
 folio_alloc+0x12a/0x330 mm/mempolicy.c:2211
 filemap_alloc_folio+0xde/0x500 mm/filemap.c:974
 __filemap_get_folio+0x431/0xbb0 mm/filemap.c:1918
 iomap_get_folio fs/iomap/buffered-io.c:567 [inline]
 __iomap_get_folio fs/iomap/buffered-io.c:714 [inline]
 iomap_write_begin+0x50c/0x1860 fs/iomap/buffered-io.c:757
 iomap_write_iter fs/iomap/buffered-io.c:924 [inline]
 iomap_file_buffered_write+0x58e/0xa60 fs/iomap/buffered-io.c:987
 blkdev_buffered_write block/fops.c:646 [inline]
 blkdev_write_iter+0x46c/0x5b0 block/fops.c:694
 do_iter_readv_writev+0x330/0x4a0
 do_iter_write+0x1f6/0x8d0 fs/read_write.c:860
 vfs_writev fs/read_write.c:933 [inline]
 do_pwritev+0x21a/0x360 fs/read_write.c:1030
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1137 [inline]
 free_unref_page_prepare+0x931/0xa60 mm/page_alloc.c:2347
 free_unref_page_list+0x5a0/0x840 mm/page_alloc.c:2533
 release_pages+0x2117/0x2400 mm/swap.c:1042
 __folio_batch_release+0x84/0x100 mm/swap.c:1062
 folio_batch_release include/linux/pagevec.h:83 [inline]
 mapping_try_invalidate+0x515/0x640 mm/truncate.c:535
 direct_write_fallback+0xda/0x150 fs/libfs.c:1957
 blkdev_write_iter+0x47d/0x5b0 block/fops.c:693
 do_iter_readv_writev+0x330/0x4a0
 do_iter_write+0x1f6/0x8d0 fs/read_write.c:860
 vfs_writev fs/read_write.c:933 [inline]
 do_pwritev+0x21a/0x360 fs/read_write.c:1030
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Memory state around the buggy address:
 ffff8880213f5f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880213f5f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880213f6000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8880213f6080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880213f6100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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