syzbot

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BUG: KASAN: use-after-free in udf_close_lvid+0x508/0x5c0 fs/udf/super.c:2035
Write of size 1 at addr ffff88802ca8a068 by task syz-executor751/5069

CPU: 0 PID: 5069 Comm: syz-executor751 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+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
 udf_close_lvid+0x508/0x5c0 fs/udf/super.c:2035
 udf_put_super+0x19c/0x200 fs/udf/super.c:2322
 generic_shutdown_super+0x161/0x3d0 fs/super.c:696
 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+0xa92/0x2ae0 kernel/exit.c:871
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1021
 __do_sys_exit_group kernel/exit.c:1032 [inline]
 __se_sys_exit_group kernel/exit.c:1030 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1030
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f442fbe5d49
Code: Unable to access opcode bytes at 0x7f442fbe5d1f.
RSP: 002b:00007ffdd5040d28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f442fbe5d49
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 00007f442fc81390 R08: ffffffffffffffb8 R09: 000000000001f22c
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f442fc81390
R13: 0000000000000000 R14: 00007f442fc82100 R15: 00007f442fbb4030
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0000b2a280 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ca8a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea0000b2a288 ffffea0000b2a288 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:
 ffff88802ca89f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802ca89f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88802ca8a000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                          ^
 ffff88802ca8a080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802ca8a100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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