netlink_rcv_skb+0x35d/0x440 net/netlink/af_netlink.c:2460
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4729
 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1343
kasan: GPF could be caused by NULL-ptr deref or user memory access
 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1908
general protection fault: 0000 [#1] SMP KASAN
CPU: 0 PID: 20114 Comm: syz-executor0 Not tainted 4.18.0-rc8+ #173
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:smc_ioctl+0x880/0x1250 net/smc/af_smc.c:1737
Code: 
 sock_sendmsg_nosec net/socket.c:640 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:650
48 
 sock_write_iter+0x362/0x5c0 net/socket.c:919
c1 
ea 03 
80 3c 
02 
 call_write_iter include/linux/fs.h:1793 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x6c6/0x9f0 fs/read_write.c:487
00 0f 
85 
e4 
07 
00 00 
4c 
8b 
 vfs_write+0x1f8/0x560 fs/read_write.c:549
ab 
 ksys_write+0x101/0x260 fs/read_write.c:598
98 
04 
00 
00 
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
48 
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
b8 00 
00 00 
00 
00 
fc 
ff df 
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
49 
RIP: 0033:0x456cb9
8d 
Code: 
7d 
fd 
20 
b4 
48 
fb ff 
89 
c3 66 
fa 48 
2e 
c1 
0f 
ea 
1f 
03 
84 
<0f> 
00 
b6 04 
00 
02 84 
00 
c0 
00 
74 
00 
08 
66 
3c 
90 
03 
48 
0f 
89 
8e 
f8 48 
c2 
89 
07 
f7 
00 
48 
00 
89 
4c 
d6 
8d 
48 
bb 
89 
f8 
ca 4d 
04 
89 
00 
c2 
4d 
RSP: 0018:ffff88019d81f5c8 EFLAGS: 00010202
89 
c8 
RAX: dffffc0000000000 RBX: ffff8801c9bb2280 RCX: ffffc90001ffd000
4c 8b 
RDX: 0000000000000004 RSI: ffffffff867dc902 RDI: 0000000000000020
4c 
RBP: ffff88019d81f9b0 R08: ffff8801c1ea4640 R09: 0000000000000000
24 08 
R10: ffffed0039376461 R11: ffff8801c9bb230b R12: 1ffff10033b03ebd
R13: 0000000000000000 R14: 0000000020000080 R15: 0000000000000001
0f 
FS:  00007fac82c29700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
05 <48> 
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000007234ec CR3: 000000019f788000 CR4: 00000000001406f0
3d 01 
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
f0 
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
ff ff 
Call Trace:
0f 
83 cb 
b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007fa20eecec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa20eecf6d4 RCX: 0000000000456cb9
RDX: 0000000000000024 RSI: 0000000020000000 RDI: 0000000000000013
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014
R13: 00000000004d64b0 R14: 00000000004c75ae R15: 0000000000000005
 sock_do_ioctl+0xe4/0x3e0 net/socket.c:968
 sock_ioctl+0x30d/0x680 net/socket.c:1092
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x456cb9
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007fac82c28c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fac82c296d4 RCX: 0000000000456cb9
RDX: 0000000020000080 RSI: 0000000000005411 RDI: 0000000000000013
RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d1128 R14: 00000000004c6d8f R15: 0000000000000001
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 173cc789bf76cbb7 ]---
RIP: 0010:smc_ioctl+0x880/0x1250 net/smc/af_smc.c:1737
Code: 48 c1 ea 03 80 3c 02 00 0f 85 e4 07 00 00 4c 8b ab 98 04 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7d 20 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e c2 07 00 00 4c 8d bb f8 04 00 
RSP: 0018:ffff88019d81f5c8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801c9bb2280 RCX: ffffc90001ffd000
RDX: 0000000000000004 RSI: ffffffff867dc902 RDI: 0000000000000020
RBP: ffff88019d81f9b0 R08: ffff8801c1ea4640 R09: 0000000000000000
R10: ffffed0039376461 R11: ffff8801c9bb230b R12: 1ffff10033b03ebd
R13: 0000000000000000 R14: 0000000020000080 R15: 0000000000000001
FS:  00007fac82c29700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000007234ec CR3: 000000019f788000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400