wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2020/09/19 18:44 (1000)
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2020/09/19 18:44 (1000)
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
==================================================================
BUG: KASAN: slab-out-of-bounds in udf_write_aext+0x780/0x860 fs/udf/inode.c:2065
Write of size 4 at addr ffff88809b764a30 by task syz-executor.0/9666

CPU: 0 PID: 9666 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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+0x780/0x860 fs/udf/inode.c:2065
 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: 0033:0x7ff7b742dae9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff7b6b61188 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007ff7b75410e0 RCX: 00007ff7b742dae9
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000005
RBP: 00007ff7b7487f25 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc1f84a5df R14: 00007ff7b6b61300 R15: 0000000000022000

Allocated by task 0:
(stack is not available)

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff88809b7647c0
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 112 bytes to the right of
 512-byte region [ffff88809b7647c0, ffff88809b7649c0)
The buggy address belongs to the page:
page:ffffea00026dd900 count:1 mapcount:0 mapping:ffff88813bff0940 index:0x0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea00027b1a88 ffffea00026aa488 ffff88813bff0940
raw: 0000000000000000 ffff88809b764040 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809b764900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809b764980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88809b764a00: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
                                     ^
 ffff88809b764a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88809b764b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================