audit: type=1400 audit(1539064729.015:6): avc:  denied  { write } for  pid=2072 comm="syz-executor528" 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: 0 PID: 2072 Comm: syz-executor528 Not tainted 4.4.159+ #108
task: ffff8801d4f717c0 task.stack: ffff8801d4000000
RIP: 0010:[<ffffffff822daf22>]  [<ffffffff822daf22>] netlink_getsockbyportid net/netlink/af_netlink.c:1112 [inline]
RIP: 0010:[<ffffffff822daf22>]  [<ffffffff822daf22>] netlink_unicast+0x1d2/0x700 net/netlink/af_netlink.c:1297
RSP: 0018:ffff8801d4007768  EFLAGS: 00010293
RAX: dffffc0000000048 RBX: dffffc0000000000 RCX: 0000000000000030
RDX: 0000000000000000 RSI: ffffffff822daf1b RDI: ffff8800b6961218
RBP: ffff8801d4007828 R08: ffffed0016e7e995 R09: ffffed0016e7e992
R10: ffffed0016e7e994 R11: ffff8800b73f4ca7 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8800b6961140 R15: ffff8801d4007800
FS:  0000000001734880(0063) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000600 CR3: 00000001d6fed000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8147eb11 0000000000000030 0000000000000240 1ffff1003a800ef4
 dffffc0000000006 dffffc0000000048 000000c000000818 0000000041b58ab3
 ffffffff82c7ac3a ffffffff822dad50 ffffffff821e2a0b 0000000000000000
Call Trace:
 [<ffffffff822dc3f6>] netlink_ack+0x236/0x4c0 net/netlink/af_netlink.c:2334
 [<ffffffff822ebae9>] nfnetlink_rcv_batch net/netfilter/nfnetlink.c:319 [inline]
 [<ffffffff822ebae9>] nfnetlink_rcv+0xc39/0x1330 net/netfilter/nfnetlink.c:477
 [<ffffffff822db23c>] netlink_unicast_kernel net/netlink/af_netlink.c:1277 [inline]
 [<ffffffff822db23c>] netlink_unicast+0x4ec/0x700 net/netlink/af_netlink.c:1303
 [<ffffffff822dbc24>] netlink_sendmsg+0x694/0xc30 net/netlink/af_netlink.c:1859
 [<ffffffff821c2ebb>] sock_sendmsg_nosec net/socket.c:638 [inline]
 [<ffffffff821c2ebb>] sock_sendmsg+0xbb/0x110 net/socket.c:648
 [<ffffffff821c4d05>] ___sys_sendmsg+0x745/0x880 net/socket.c:1975
 [<ffffffff821c7d56>] __sys_sendmsg+0xd6/0x190 net/socket.c:2009
 [<ffffffff821c7e3d>] SYSC_sendmsg net/socket.c:2020 [inline]
 [<ffffffff821c7e3d>] SyS_sendmsg+0x2d/0x50 net/socket.c:2016
 [<ffffffff82705ca1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Code: 85 bf 02 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 65 bf 02 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  [<ffffffff822daf22>] netlink_getsockbyportid net/netlink/af_netlink.c:1112 [inline]
RIP  [<ffffffff822daf22>] netlink_unicast+0x1d2/0x700 net/netlink/af_netlink.c:1297
 RSP <ffff8801d4007768>
---[ end trace 4cdf3c079085e08c ]---