netlink: 'syz-executor5': attribute type 39 has an invalid length.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 1932ee067 P4D 1932ee067 PUD 1932ed067 PMD 0 
Oops: 0010 [#1] SMP KASAN
CPU: 0 PID: 11423 Comm: syz-executor2 Not tainted 4.17.0+ #84
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:          (null)
Code: Bad RIP value.
RSP: 0018:ffff88018f16f590 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801cf2bf000 RCX: 1ffffffff10ea9fd
RDX: ffff88018f16fab0 RSI: ffff880195814480 RDI: ffff8801b3b31a80
RBP: ffff88018f16f700 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10031e2deb7
R13: ffff88018f16fab0 R14: ffff8801cf2bf012 R15: ffff8801cf2bf458
FS:  00007f1862c0d700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001932ef000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 sock_poll+0x1d1/0x710 net/socket.c:1168
 vfs_poll+0x77/0x2a0 fs/select.c:40
 do_pollfd fs/select.c:848 [inline]
 do_poll fs/select.c:896 [inline]
 do_sys_poll+0x6fd/0x1100 fs/select.c:990
 __do_sys_poll fs/select.c:1048 [inline]
 __se_sys_poll fs/select.c:1036 [inline]
 __x64_sys_poll+0x189/0x510 fs/select.c:1036
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455b29
Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f1862c0cc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000007
RAX: ffffffffffffffda RBX: 00007f1862c0d6d4 RCX: 0000000000455b29
RDX: 0000000000000006 RSI: 0000000000000002 RDI: 0000000020000000
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c06c7 R14: 00000000004d0030 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000000000000
---[ end trace 481a510398288ebc ]---
RIP: 0010:          (null)
Code: Bad RIP value.
RSP: 0018:ffff88018f16f590 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801cf2bf000 RCX: 1ffffffff10ea9fd
RDX: ffff88018f16fab0 RSI: ffff880195814480 RDI: ffff8801b3b31a80
RBP: ffff88018f16f700 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10031e2deb7
R13: ffff88018f16fab0 R14: ffff8801cf2bf012 R15: ffff8801cf2bf458
FS:  00007f1862c0d700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001932ef000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400