================================================================== BUG: KASAN: use-after-free in crc_itu_t+0xd7/0xe0 lib/crc-itu-t.c:60 Read of size 1 at addr ffff88805d115000 by task syz-executor.2/10712 CPU: 1 PID: 10712 Comm: syz-executor.2 Not tainted 6.7.0-rc5-syzkaller-00270-g0e389834672c #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 crc_itu_t+0xd7/0xe0 lib/crc-itu-t.c:60 udf_finalize_lvid+0xf2/0x1f0 fs/udf/super.c:1984 udf_sync_fs+0xea/0x150 fs/udf/super.c:2340 sync_filesystem+0x109/0x280 fs/sync.c:56 generic_shutdown_super+0x7e/0x3d0 fs/super.c:669 kill_block_super+0x3b/0x90 fs/super.c:1667 deactivate_locked_super+0xbc/0x1a0 fs/super.c:484 deactivate_super+0xde/0x100 fs/super.c:517 cleanup_mnt+0x222/0x450 fs/namespace.c:1256 task_work_run+0x14d/0x240 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa8a/0x2ad0 kernel/exit.c:869 do_group_exit+0xd4/0x2a0 kernel/exit.c:1018 get_signal+0x23b5/0x2790 kernel/signal.c:2904 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x121/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296 __do_fast_syscall_32+0x6f/0xe0 arch/x86/entry/common.c:324 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x70/0x7a RIP: 0023:0xf7f5b579 Code: Unable to access opcode bytes at 0xf7f5b54f. RSP: 002b:00000000f7f564b0 EFLAGS: 00000293 ORIG_RAX: 000000000000010b RAX: fffffffffffffdfc RBX: 0000000000000000 RCX: 0000000000000000 RDX: 00000000f7f564e4 RSI: 00000000f7f564dc RDI: 00000000f7f564e4 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the physical page: page:ffffea0001744540 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x1 pfn:0x5d115 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: 0xffffff7f(buddy) raw: 04fff00000000000 ffffea0001730cc8 ffffea0001aff908 0000000000000000 raw: 0000000000000001 0000000000000000 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 0x100cca(GFP_HIGHUSER_MOVABLE), pid 15712, tgid 15711 (syz-executor.1), ts 1013229244935, free_ts 1013944542283 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0xa25/0x36d0 mm/page_alloc.c:3312 __alloc_pages+0x22e/0x2420 mm/page_alloc.c:4568 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133 shmem_alloc_folio+0x10d/0x140 mm/shmem.c:1630 shmem_alloc_and_add_folio+0x147/0x7b0 mm/shmem.c:1670 shmem_get_folio_gfp+0x623/0x1360 mm/shmem.c:2054 shmem_fault+0x205/0xa90 mm/shmem.c:2230 __do_fault+0x107/0x600 mm/memory.c:4266 do_read_fault mm/memory.c:4629 [inline] do_fault mm/memory.c:4763 [inline] do_pte_missing mm/memory.c:3731 [inline] handle_pte_fault mm/memory.c:5039 [inline] __handle_mm_fault+0x2683/0x3d70 mm/memory.c:5180 handle_mm_fault+0x47a/0xa10 mm/memory.c:5345 faultin_page mm/gup.c:956 [inline] __get_user_pages+0x4b2/0x1490 mm/gup.c:1239 populate_vma_page_range+0x2d4/0x420 mm/gup.c:1677 __mm_populate+0x1d7/0x380 mm/gup.c:1786 mm_populate include/linux/mm.h:3379 [inline] vm_mmap_pgoff+0x2cd/0x3c0 mm/util.c:561 ksys_mmap_pgoff+0x7d/0x5b0 mm/mmap.c:1425 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+0x4fa/0xaa0 mm/page_alloc.c:2347 free_unref_page_list+0xe6/0xb40 mm/page_alloc.c:2533 release_pages+0x32a/0x14f0 mm/swap.c:1042 __folio_batch_release+0x77/0xe0 mm/swap.c:1062 folio_batch_release include/linux/pagevec.h:83 [inline] shmem_undo_range+0x57a/0x1140 mm/shmem.c:1004 shmem_truncate_range mm/shmem.c:1113 [inline] shmem_evict_inode+0x39f/0xba0 mm/shmem.c:1241 evict+0x2ed/0x6b0 fs/inode.c:666 iput_final fs/inode.c:1777 [inline] iput.part.0+0x560/0x7b0 fs/inode.c:1803 iput+0x5c/0x80 fs/inode.c:1793 dentry_unlink_inode+0x292/0x430 fs/dcache.c:401 __dentry_kill+0x3b8/0x640 fs/dcache.c:607 dentry_kill fs/dcache.c:733 [inline] dput+0x7eb/0xd90 fs/dcache.c:913 __fput+0x3b9/0xb70 fs/file_table.c:402 task_work_run+0x14d/0x240 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa8a/0x2ad0 kernel/exit.c:869 do_group_exit+0xd4/0x2a0 kernel/exit.c:1018 Memory state around the buggy address: ffff88805d114f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805d114f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805d115000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88805d115080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88805d115100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================