audit: type=1400 audit(1541901918.584:6): avc:  denied  { write } for  pid=2087 comm="syz-executor763" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 2087 Comm: syz-executor763 Not tainted 4.4.163+ #11
task: ffff8800b7e6c740 task.stack: ffff8801d3820000
RIP: 0010:[<ffffffff822e7c42>]  [<ffffffff822e7c42>] netlink_getsockbyportid net/netlink/af_netlink.c:1112 [inline]
RIP: 0010:[<ffffffff822e7c42>]  [<ffffffff822e7c42>] netlink_unicast+0x1d2/0x700 net/netlink/af_netlink.c:1297
RSP: 0018:ffff8801d38276e8  EFLAGS: 00010293
RAX: dffffc0000000048 RBX: dffffc0000000000 RCX: 0000000000000030
RDX: 0000000000000000 RSI: ffffffff822e7c3b RDI: ffff8801d8127998
RBP: ffff8801d38277a8 R08: ffffed0016d76635 R09: ffffed0016d76632
R10: ffffed0016d76634 R11: ffff8800b6bb31a7 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8801d81278c0 R15: ffff8801d3827780
FS:  0000000000000000(0000) GS:ffff8801db700000(0063) knlGS:0000000009cc7840
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007fff81509f28 CR3: 00000001d5761000 CR4: 00000000001606b0
Stack:
 ffffffff8147ec91 0000000000000030 0000000000000240 1ffff1003a704ee4
 dffffc0000000006 dffffc0000000048 000000c000000827 0000000041b58ab3
 ffffffff82c7ba16 ffffffff822e7a70 ffffffff821ef53b 0000000000000000
Call Trace:
 [<ffffffff822e9116>] netlink_ack+0x236/0x4c0 net/netlink/af_netlink.c:2334
 [<ffffffff822f8809>] nfnetlink_rcv_batch net/netfilter/nfnetlink.c:319 [inline]
 [<ffffffff822f8809>] nfnetlink_rcv+0xc39/0x1330 net/netfilter/nfnetlink.c:477
 [<ffffffff822e7f5c>] netlink_unicast_kernel net/netlink/af_netlink.c:1277 [inline]
 [<ffffffff822e7f5c>] netlink_unicast+0x4ec/0x700 net/netlink/af_netlink.c:1303
 [<ffffffff822e8944>] netlink_sendmsg+0x694/0xc30 net/netlink/af_netlink.c:1859
 [<ffffffff821cf9eb>] sock_sendmsg_nosec net/socket.c:638 [inline]
 [<ffffffff821cf9eb>] sock_sendmsg+0xbb/0x110 net/socket.c:648
 [<ffffffff821d1835>] ___sys_sendmsg+0x745/0x880 net/socket.c:1975
 [<ffffffff821d4886>] __sys_sendmsg+0xd6/0x190 net/socket.c:2009
 [<ffffffff822a5b2a>] C_SYSC_sendmsg net/compat.c:722 [inline]
 [<ffffffff822a5b2a>] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:720
 [<ffffffff8100629e>] do_syscall_32_irqs_on arch/x86/entry/common.c:396 [inline]
 [<ffffffff8100629e>] do_fast_syscall_32+0x31e/0xa80 arch/x86/entry/common.c:463
 [<ffffffff82713b50>] sysenter_flags_fixed+0xd/0x1a
Code: 65 f6 01 ff 49 8d 57 c0 4c 89 e1 4c 89 f6 48 89 df e8 43 f7 ff ff 83 f8 01 0f 85 cf 03 00 00 e8 45 f6 01 ff 48 8b 85 68 ff ff ff <0f> b6 00 84 c0 74 08 3c 03 0f 8e ff 03 00 00 48 8b 85 60 ff ff 
RIP  [<ffffffff822e7c42>] netlink_getsockbyportid net/netlink/af_netlink.c:1112 [inline]
RIP  [<ffffffff822e7c42>] netlink_unicast+0x1d2/0x700 net/netlink/af_netlink.c:1297
 RSP <ffff8801d38276e8>
---[ end trace a6dd80eb7613c42e ]---