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BUG: KASAN: use-after-free in udf_close_lvid+0x674/0x990 fs/udf/super.c:2108
Write of size 1 at addr ffff88809ab26098 by task syz-executor/4356

CPU: 1 PID: 4356 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 udf_close_lvid+0x674/0x990 fs/udf/super.c:2108
 udf_put_super+0xc8/0x160 fs/udf/super.c:2395
 generic_shutdown_super+0x130/0x300 fs/super.c:475
 kill_block_super+0x7c/0xe0 fs/super.c:1427
 deactivate_locked_super+0x93/0xf0 fs/super.c:335
 cleanup_mnt+0x418/0x4d0 fs/namespace.c:1139
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0x61e/0x20a0 kernel/exit.c:883
 do_group_exit+0x12e/0x300 kernel/exit.c:997
 get_signal+0x6ca/0x12c0 kernel/signal.c:2900
 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f7f7bbba69f
Code: Unable to access opcode bytes at RIP 0x7f7f7bbba675.
RSP: 002b:00007ffe08783e80 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: 0000000000000004 RBX: 0000000000000003 RCX: 00007f7f7bbba69f
RDX: 0000000000000004 RSI: 00007ffe08783f40 RDI: 00000000000000f8
RBP: 00007ffe08783eec R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000010cfe R15: 00007ffe08783f40
 </TASK>

The buggy address belongs to the page:
page:ffffea00026ac980 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9ab26
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea00026ac988 ffffea00026ac988 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffff88809ab25f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88809ab26000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88809ab26080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                            ^
 ffff88809ab26100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88809ab26180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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