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BUG: KASAN: slab-out-of-bounds in udf_write_aext+0x847/0x860 fs/udf/inode.c:2059
Write of size 4 at addr ffff8880954080b8 by task syz-executor381/8104

CPU: 1 PID: 8104 Comm: syz-executor381 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_store_n_noabort+0x8b/0xa0 mm/kasan/report.c:449
 udf_write_aext+0x847/0x860 fs/udf/inode.c:2059
 udf_add_entry+0xdab/0x2a20 fs/udf/namei.c:496
 udf_mkdir+0x145/0x650 fs/udf/namei.c:693
 vfs_mkdir+0x508/0x7a0 fs/namei.c:3819
 do_mkdirat+0x262/0x2d0 fs/namei.c:3842
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fc656f3f519
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc6151b488 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc656f3f519
RDX: 00000000000001ff RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 00007fc656efeaf0 R08: 00007ffc6151b360 R09: 0000000000000000
R10: 00007ffc6151b350 R11: 0000000000000246 R12: 00007fc656efeb80
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 8104:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15a/0x3c0 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 kzalloc include/linux/slab.h:709 [inline]
 udf_new_inode+0x220/0xf30 fs/udf/ialloc.c:75
 udf_mkdir+0xa8/0x650 fs/udf/namei.c:686
 vfs_mkdir+0x508/0x7a0 fs/namei.c:3819
 do_mkdirat+0x262/0x2d0 fs/namei.c:3842
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 6267:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 kernfs_fop_release+0x120/0x190 fs/kernfs/file.c:783
 __fput+0x2ce/0x890 fs/file_table.c:278
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880954080c0
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 8 bytes to the left of
 512-byte region [ffff8880954080c0, ffff8880954082c0)
The buggy address belongs to the page:
page:ffffea0002550200 count:1 mapcount:0 mapping:ffff88813bff0940 index:0x0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea000277b688 ffffea0002ca7988 ffff88813bff0940
raw: 0000000000000000 ffff8880954080c0 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888095407f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888095408000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888095408080: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
                                        ^
 ffff888095408100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888095408180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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