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BUG: KASAN: use-after-free in udf_close_lvid+0x674/0x990 fs/udf/super.c:2105
Write of size 1 at addr ffff8880b162c398 by task syz-executor/4270

CPU: 1 PID: 4270 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:420
 kasan_report+0x10b/0x140 mm/kasan/report.c:524
 udf_close_lvid+0x674/0x990 fs/udf/super.c:2105
 udf_put_super+0xc8/0x160 fs/udf/super.c:2392
 generic_shutdown_super+0x130/0x340 fs/super.c:501
 kill_block_super+0x7c/0xe0 fs/super.c:1470
 deactivate_locked_super+0x93/0xf0 fs/super.c:332
 cleanup_mnt+0x463/0x4f0 fs/namespace.c:1191
 task_work_run+0x1ca/0x250 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7d8a990a77
Code: a8 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 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffd411a97e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f7d8aa13d7d RCX: 00007f7d8a990a77
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd411a98a0
RBP: 00007ffd411a98a0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd411aa930
R13: 00007f7d8aa13d7d R14: 0000000000000005 R15: 00007ffd411aa970
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0002c58b00 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xb162c
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0002c58b08 ffffea0002c58b08 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:
 ffff8880b162c280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880b162c300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8880b162c380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                            ^
 ffff8880b162c400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880b162c480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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