syzbot

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memcpy: detected field-spanning write (size 28) of single field "&errmsg->msg" at net/netlink/af_netlink.c:2447 (size 16)
WARNING: CPU: 1 PID: 3185 at net/netlink/af_netlink.c:2447 netlink_ack+0x682/0xbc0 net/netlink/af_netlink.c:2447
Modules linked in:
CPU: 0 PID: 3185 Comm: dhcpcd Not tainted 6.0.0-syzkaller-00668-g3eba620e7bd7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:netlink_ack+0x682/0xbc0 net/netlink/af_netlink.c:2447
Code: 00 e8 82 96 1c f9 c6 05 45 ef 8d 05 01 b9 10 00 00 00 48 c7 c7 80 fc a3 8b 4c 89 e6 48 c7 c2 20 fd a3 8b 31 c0 e8 3e ff e4 f8 <0f> 0b e9 2f ff ff ff e8 52 96 1c f9 0f 0b 80 7c 24 64 00 75 b8 4d
RSP: 0018:ffffc9000300f6a0 EFLAGS: 00010246
RAX: 8fa74595cf3c6300 RBX: ffff88801cd09414 RCX: ffff888026cabb00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000300f7b0 R08: ffffffff816ae74d R09: ffffed10173667f1
R10: ffffed10173667f1 R11: 1ffff110173667f0 R12: 000000000000001c
R13: ffff88801cb74640 R14: ffffc9000300f820 R15: ffff88801cd09400
FS:  00007fbd79483740(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbd7963ba70 CR3: 0000000025b47000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 netlink_rcv_skb+0x289/0x460 net/netlink/af_netlink.c:2507
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x7e7/0x9c0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x9b3/0xcd0 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0x5be/0x9b0 net/socket.c:2482
 ___sys_sendmsg net/socket.c:2536 [inline]
 __sys_sendmsg+0x23e/0x340 net/socket.c:2565
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbd7957b163
Code: 64 89 02 48 c7 c0 ff ff ff ff eb b7 66 2e 0f 1f 84 00 00 00 00 00 90 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 89 54 24 1c 48
RSP: 002b:00007ffd387fff08 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbd7957b163
RDX: 0000000000000000 RSI: 00007ffd387fff50 RDI: 0000000000000010
RBP: 00007ffd38804198 R08: 0000000000000000 R09: 0000000000000000
R10: 00007fbd795fafc0 R11: 0000000000000246 R12: 0000000000000010
R13: 00007ffd38803fb0 R14: 0000000000000000 R15: 00005584d8cee2e0
 </TASK>