netlink: 20 bytes leftover after parsing attributes in process `syz-executor.3'.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 25613 Comm: syz-executor.3 Not tainted 4.14.170-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88805754e380 task.stack: ffff88809b108000
RIP: 0010:nfnetlink_parse_nat net/netfilter/nf_nat_core.c:747 [inline]
RIP: 0010:nfnetlink_parse_nat_setup+0x1fb/0x3b0 net/netfilter/nf_nat_core.c:784
RSP: 0018:ffff88809b10f208 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88809b10f290 RCX: ffffc90009035000
RDX: 0000000020000007 RSI: ffffffff854773ef RDI: 000000010000003a
RBP: ffff88809b10f308 R08: 0000000000000050 R09: ffff88805754ec20
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888095bb2dc0
R13: 0000000000000000 R14: ffff88809b10f2e0 R15: ffff88809b10f240
FS:  00007efd69b17700(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30828000 CR3: 000000005430c000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ctnetlink_parse_nat_setup+0x76/0x4a0 net/netfilter/nf_conntrack_netlink.c:1421
 ctnetlink_setup_nat net/netfilter/nf_conntrack_netlink.c:1491 [inline]
 ctnetlink_create_conntrack+0x468/0x10c0 net/netfilter/nf_conntrack_netlink.c:1840
 ctnetlink_new_conntrack+0x4af/0xcc0 net/netfilter/nf_conntrack_netlink.c:1964
 nfnetlink_rcv_msg+0xa08/0xc00 net/netfilter/nfnetlink.c:214
 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432
 nfnetlink_rcv+0x1ab/0x1650 net/netfilter/nfnetlink.c:515
 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
 netlink_unicast+0x44d/0x650 net/netlink/af_netlink.c:1312
 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xce/0x110 net/socket.c:656
 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062
 __sys_sendmsg+0xb9/0x140 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2103
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b3b9
RSP: 002b:00007efd69b16c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007efd69b176d4 RCX: 000000000045b3b9
RDX: 0000000000000000 RSI: 0000000020000640 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000943 R14: 00000000004caa79 R15: 000000000075bf2c
Code: d5 fd 85 c0 0f 88 44 01 00 00 e8 c1 a0 15 fc 48 8b 85 10 ff ff ff 48 8d 78 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 98 01 00 00 48 8b 85 10 ff ff ff 4c 89 fe 48 
RIP: nfnetlink_parse_nat net/netfilter/nf_nat_core.c:747 [inline] RSP: ffff88809b10f208
RIP: nfnetlink_parse_nat_setup+0x1fb/0x3b0 net/netfilter/nf_nat_core.c:784 RSP: ffff88809b10f208
---[ end trace 161efd3e743fcb7b ]---