==================================================================
BUG: KASAN: use-after-free in udf_get_fileident+0x233/0x250 fs/udf/directory.c:176
Read of size 2 at addr ffff8880af8054ec by task syz-executor.1/12400

CPU: 1 PID: 12400 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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_load_n_noabort+0x8b/0xa0 mm/kasan/report.c:443
 udf_get_fileident+0x233/0x250 fs/udf/directory.c:176
 udf_fileident_read+0x550/0x1930 fs/udf/directory.c:37
 udf_readdir+0x559/0x1350 fs/udf/dir.c:129
 iterate_dir+0x473/0x5c0 fs/readdir.c:51
 ksys_getdents64+0x175/0x2b0 fs/readdir.c:357
nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based  firewall rule not found. Use the iptables CT target to attach helpers instead.
 __do_sys_getdents64 fs/readdir.c:376 [inline]
 __se_sys_getdents64 fs/readdir.c:373 [inline]
 __x64_sys_getdents64+0x6f/0xb0 fs/readdir.c:373
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f8f27636639
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8f25ba9168 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f8f27756f80 RCX: 00007f8f27636639
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f8f27691ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdc3de043f R14: 00007f8f25ba9300 R15: 0000000000022000

Allocated by task 12371:
 __do_kmalloc_node mm/slab.c:3689 [inline]
 __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 __alloc_skb+0xae/0x560 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:995 [inline]
 alloc_uevent_skb+0x7b/0x210 lib/kobject_uevent.c:289
 uevent_net_broadcast_untagged lib/kobject_uevent.c:325 [inline]
 kobject_uevent_net_broadcast lib/kobject_uevent.c:407 [inline]
 kobject_uevent_env+0xa90/0x1480 lib/kobject_uevent.c:591
 loop_set_fd drivers/block/loop.c:1005 [inline]
 lo_ioctl+0xff9/0x20e0 drivers/block/loop.c:1576
 __blkdev_driver_ioctl block/ioctl.c:303 [inline]
 blkdev_ioctl+0x5cb/0x1a80 block/ioctl.c:601
 block_ioctl+0xe9/0x130 fs/block_dev.c:1906
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 4696:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 skb_free_head net/core/skbuff.c:563 [inline]
 skb_release_data+0x6de/0x920 net/core/skbuff.c:583
 skb_release_all net/core/skbuff.c:640 [inline]
 __kfree_skb net/core/skbuff.c:654 [inline]
 consume_skb+0x113/0x3d0 net/core/skbuff.c:714
 skb_free_datagram+0x16/0xf0 net/core/datagram.c:329
 netlink_recvmsg+0x627/0xea0 net/netlink/af_netlink.c:1996
 sock_recvmsg_nosec net/socket.c:859 [inline]
 sock_recvmsg net/socket.c:866 [inline]
 sock_recvmsg+0xca/0x110 net/socket.c:862
 ___sys_recvmsg+0x255/0x570 net/socket.c:2389
 __sys_recvmsg net/socket.c:2438 [inline]
 __do_sys_recvmsg net/socket.c:2448 [inline]
 __se_sys_recvmsg net/socket.c:2445 [inline]
 __x64_sys_recvmsg+0x12f/0x220 net/socket.c:2445
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880af805340
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 428 bytes inside of
 512-byte region [ffff8880af805340, ffff8880af805540)
The buggy address belongs to the page:
page:ffffea0002be0140 count:1 mapcount:0 mapping:ffff88813bff0940 index:0xffff8880af805d40
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea00025575c8 ffffea000272a648 ffff88813bff0940
raw: ffff8880af805d40 ffff8880af8050c0 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880af805380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880af805400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880af805480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff8880af805500: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880af805580: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
==================================================================