netlink: 'syz.5.4548': attribute type 6 has an invalid length.
------------[ cut here ]------------
err == -EMSGSIZE
WARNING: net/core/rtnetlink.c:4594 at rtmsg_ifinfo_build_skb+0x1c1/0x260 net/core/rtnetlink.c:4594, CPU#3: syz.5.4548/22404
Modules linked in:
CPU: 3 UID: 0 PID: 22404 Comm: syz.5.4548 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:rtmsg_ifinfo_build_skb+0x1c1/0x260 net/core/rtnetlink.c:4594
Code: ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 80 00 00 00 45 8b 76 08 e9 3c ff ff ff e8 e0 f4 6c f8 90 <0f> 0b 90 ba 02 00 00 00 48 89 ee 31 ff bb a6 ff ff ff e8 38 7d f0
RSP: 0018:ffffc900056b6da8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 00000000ffffffa6 RCX: 0000000000000000
RDX: ffff8880280b0000 RSI: ffffffff899e0cf0 RDI: ffff8880280b0000
RBP: ffff888065a632c0 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffa6 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88802bcd8108
FS:  00007febc45fe6c0(0000) GS:ffff8880d5ea2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001140 CR3: 00000000278b8000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000460
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rtmsg_ifinfo_event net/core/rtnetlink.c:4622 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:4612 [inline]
 rtnetlink_event+0x137/0x1f0 net/core/rtnetlink.c:7192
 notifier_call_chain+0x99/0x3f0 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2275
 call_netdevice_notifiers_extack net/core/dev.c:2313 [inline]
 call_netdevice_notifiers net/core/dev.c:2327 [inline]
 netdev_features_change net/core/dev.c:1612 [inline]
 netdev_update_features net/core/dev.c:11165 [inline]
 netdev_update_features net/core/dev.c:11162 [inline]
 netif_disable_lro+0x3e9/0x660 net/core/dev.c:1854
 ipv6_add_dev+0xde0/0x1520 net/ipv6/addrconf.c:409
 addrconf_notify+0x5db/0x1ba0 net/ipv6/addrconf.c:3686
 notifier_call_chain+0x99/0x3f0 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2275
 call_netdevice_notifiers_extack net/core/dev.c:2313 [inline]
 call_netdevice_notifiers net/core/dev.c:2327 [inline]
 register_netdevice+0x1998/0x25a0 net/core/dev.c:11541
 macsec_newlink+0x4fb/0x1c50 drivers/net/macsec.c:4223
 rtnl_newlink_create net/core/rtnetlink.c:3969 [inline]
 __rtnl_newlink net/core/rtnetlink.c:4098 [inline]
 rtnl_newlink+0x1697/0x2620 net/core/rtnetlink.c:4215
 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7132
 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2556
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:815 [inline]
 ____sys_sendmsg+0xa4d/0xbe0 net/socket.c:2713
 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2767
 __sys_sendmsg+0x160/0x210 net/socket.c:2799
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7febc379e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007febc45fe028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007febc3a25fa0 RCX: 00007febc379e0d9
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000004
RBP: 00007febc3835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007febc3a26038 R14: 00007febc3a25fa0 R15: 00007ffe1805fff8
 </TASK>