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BUG: KASAN: use-after-free in crc_itu_t+0xd2/0xe0 lib/crc-itu-t.c:60
Read of size 1 at addr ffff888048160000 by task syz-executor.0/8328

CPU: 0 PID: 8328 Comm: syz-executor.0 Not tainted 6.3.0-rc4-syzkaller-00025-g3a93e40326c8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:319
 print_report mm/kasan/report.c:430 [inline]
 kasan_report+0x11c/0x130 mm/kasan/report.c:536
 crc_itu_t+0xd2/0xe0 lib/crc-itu-t.c:60
 udf_finalize_lvid+0xe0/0x1d0 fs/udf/super.c:1988
 udf_sync_fs+0xea/0x150 fs/udf/super.c:2344
 sync_fs_one_sb fs/sync.c:84 [inline]
 sync_fs_one_sb+0x10b/0x150 fs/sync.c:80
 iterate_supers+0x140/0x2a0 fs/super.c:745
 ksys_sync+0x9b/0x150 fs/sync.c:103
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 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
RIP: 0033:0x7fd02ac8c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fd0297fe168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fd02adabf80 RCX: 00007fd02ac8c0f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fd02ace7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd931133ef R14: 00007fd0297fe300 R15: 0000000000022000
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001205800 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x1 pfn:0x48160
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea00010da408 ffffea0000bd8808 0000000000000000
raw: 0000000000000001 0000000000000004 00000000ffffff7f 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 6662, tgid 6657 (syz-executor.4), ts 2234618716041, free_ts 2235850758128
 prep_new_page mm/page_alloc.c:2553 [inline]
 get_page_from_freelist+0x1190/0x2e20 mm/page_alloc.c:4326
 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:5592
 __folio_alloc+0x16/0x40 mm/page_alloc.c:5624
 vma_alloc_folio+0x155/0x880 mm/mempolicy.c:2244
 shmem_alloc_folio+0xff/0x1c0 mm/shmem.c:1574
 shmem_alloc_and_acct_folio+0x15e/0x5d0 mm/shmem.c:1598
 shmem_get_folio_gfp+0xacd/0x1950 mm/shmem.c:1937
 shmem_get_folio mm/shmem.c:2068 [inline]
 shmem_write_begin+0x14a/0x380 mm/shmem.c:2561
 generic_perform_write+0x256/0x570 mm/filemap.c:3926
 __generic_file_write_iter+0x2ae/0x500 mm/filemap.c:4054
 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4086
 call_write_iter include/linux/fs.h:1851 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x9ed/0xe10 fs/read_write.c:584
 ksys_write+0x12b/0x250 fs/read_write.c:637
 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:1454 [inline]
 free_pcp_prepare+0x5d5/0xa50 mm/page_alloc.c:1504
 free_unref_page_prepare mm/page_alloc.c:3388 [inline]
 free_unref_page_list+0x176/0xbc0 mm/page_alloc.c:3529
 release_pages+0xcd7/0x1380 mm/swap.c:1042
 __pagevec_release+0x77/0xe0 mm/swap.c:1062
 pagevec_release include/linux/pagevec.h:63 [inline]
 folio_batch_release include/linux/pagevec.h:132 [inline]
 shmem_undo_range+0x595/0x1340 mm/shmem.c:946
 shmem_truncate_range mm/shmem.c:1041 [inline]
 shmem_evict_inode+0x32f/0xb60 mm/shmem.c:1156
 evict+0x2ed/0x6b0 fs/inode.c:665
 iput_final fs/inode.c:1748 [inline]
 iput.part.0+0x50a/0x740 fs/inode.c:1774
 iput+0x5c/0x80 fs/inode.c:1764
 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+0x865/0xe10 fs/dcache.c:913
 __fput+0x3cc/0xa90 fs/file_table.c:329
 task_work_run+0x16f/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+0x210/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297

Memory state around the buggy address:
 ffff88804815ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804815ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888048160000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888048160080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888048160100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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