netlink: 'syz-executor2': attribute type 7 has an invalid length.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 1cad65067 P4D 1cad65067 PUD 1b737e067 PMD 0 
Oops: 0010 [#1] SMP KASAN
CPU: 0 PID: 9505 Comm: syz-executor0 Not tainted 4.18.0-rc2+ #121
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:          (null)
Code: Bad RIP value.
RSP: 0018:ffff88019bd07688 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801d25d7940 RCX: ffffc90001df4000
RDX: ffff88019bd079e0 RSI: ffff8801d25d7940 RDI: ffff8801afd01040
RBP: ffff88019bd07730 R08: ffff8801b62d6040 R09: ffff88019bd071e0
R10: 0000000000000003 R11: 0000000000000000 R12: ffff88019bd079e0
R13: ffff8801afd01040 R14: ffffffff8818a920 R15: ffff8801b1128d00
FS:  00007f774464b700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000019e2f9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vfs_poll include/linux/poll.h:86 [inline]
 do_pollfd fs/select.c:825 [inline]
 do_poll fs/select.c:873 [inline]
 do_sys_poll+0x74d/0x1180 fs/select.c:967
 __do_sys_ppoll fs/select.c:1075 [inline]
 __se_sys_ppoll fs/select.c:1047 [inline]
 __x64_sys_ppoll+0x2fe/0x610 fs/select.c:1047
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a99
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:00007f774464ac68 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
RAX: ffffffffffffffda RBX: 00007f774464b6d4 RCX: 0000000000455a99
RDX: 0000000020001800 RSI: 0000000000000003 RDI: 00000000200017c0
RBP: 000000000072bea0 R08: 0000000000000008 R09: 0000000000000000
R10: 0000000020001840 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c0638 R14: 00000000004cffc0 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000000000000
---[ end trace 4c2e72e5dbeb88e2 ]---
RIP: 0010:          (null)
netlink: 'syz-executor2': attribute type 7 has an invalid length.
Code: Bad RIP value.
RSP: 0018:ffff88019bd07688 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801d25d7940 RCX: ffffc90001df4000
RDX: ffff88019bd079e0 RSI: ffff8801d25d7940 RDI: ffff8801afd01040
RBP: ffff88019bd07730 R08: ffff8801b62d6040 R09: ffff88019bd071e0
R10: 0000000000000003 R11: 0000000000000000 R12: ffff88019bd079e0
R13: ffff8801afd01040 R14: ffffffff8818a920 R15: ffff8801b1128d00
FS:  00007f774464b700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000019e2f9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400