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BUG: KASAN: slab-out-of-bounds in udf_get_fileident+0x233/0x250 fs/udf/directory.c:176
Read of size 2 at addr ffff8880a5880784 by task syz-executor.5/7050

CPU: 0 PID: 7050 Comm: syz-executor.5 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
 __do_sys_getdents fs/readdir.c:271 [inline]
 __se_sys_getdents+0x175/0x2d0 fs/readdir.c:252
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fe837929639
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:00007fe835e9c168 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007fe837a49f80 RCX: 00007fe837929639
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007fe837984a41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffbedf978f R14: 00007fe835e9c300 R15: 0000000000022000

Allocated by task 29075:
 __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]
 new_dir fs/proc/proc_sysctl.c:951 [inline]
 get_subdir fs/proc/proc_sysctl.c:996 [inline]
 __register_sysctl_table+0x930/0x1090 fs/proc/proc_sysctl.c:1339
 __addrconf_sysctl_register+0x1db/0x3d0 net/ipv6/addrconf.c:6604
 addrconf_sysctl_register+0x139/0x1d0 net/ipv6/addrconf.c:6651
 ipv6_add_dev+0xa8a/0x10b0 net/ipv6/addrconf.c:446
 addrconf_notify+0x6a3/0x21f0 net/ipv6/addrconf.c:3447
 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93
 call_netdevice_notifiers net/core/dev.c:1762 [inline]
 register_netdevice+0xdd2/0x10f0 net/core/dev.c:8761
 veth_newlink+0x3eb/0x930 drivers/net/veth.c:1142
 rtnl_newlink+0x1030/0x15c0 net/core/rtnetlink.c:3141
 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4782
 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2463
 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline]
 netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351
 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xc3/0x120 net/socket.c:661
 __sys_sendto+0x21a/0x320 net/socket.c:1899
 __do_sys_sendto net/socket.c:1911 [inline]
 __se_sys_sendto net/socket.c:1907 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1907
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 21049:
 __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
 netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline]
 netlink_unicast+0x4dd/0x690 net/netlink/af_netlink.c:1351
 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xc3/0x120 net/socket.c:661
 __sys_sendto+0x21a/0x320 net/socket.c:1899
 __do_sys_sendto net/socket.c:1911 [inline]
 __se_sys_sendto net/socket.c:1907 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1907
 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 ffff8880a58805c0
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 452 bytes inside of
 512-byte region [ffff8880a58805c0, ffff8880a58807c0)
The buggy address belongs to the page:
page:ffffea0002962000 count:1 mapcount:0 mapping:ffff88813bff0940 index:0x0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea0002a71888 ffffea000292c908 ffff88813bff0940
raw: 0000000000000000 ffff8880a58800c0 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a5880680: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
 ffff8880a5880700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880a5880780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8880a5880800: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
 ffff8880a5880880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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