audit: type=1400 audit(1583239992.724:38): avc:  denied  { write } for  pid=8217 comm="syz-executor572" 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: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8217 Comm: syz-executor572 Not tainted 4.19.107-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:nfnetlink_parse_nat net/netfilter/nf_nat_core.c:847 [inline]
RIP: 0010:nfnetlink_parse_nat_setup+0x21a/0x410 net/netfilter/nf_nat_core.c:884
Code: c3 89 c6 e8 f8 7f 95 fb 85 db 0f 88 72 01 00 00 e8 7b 7e 95 fb 49 8d 7e 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 d2 01 00 00 48 8b 7c 24 08 4c 89 fe 41 ff 56 38
RSP: 0018:ffff88808ffe71e0 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff85d21a38
RDX: 0000000000000007 RSI: ffffffff85d21a45 RDI: 000000000000003c
RBP: ffff8880a07ed040 R08: ffff888091d8c280 R09: ffff88808ffe7260
R10: ffffed1011ffce51 R11: ffff88808ffe728f R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000004 R15: ffff88808ffe7210
FS:  0000000000c0a880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000280 CR3: 0000000089508000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ctnetlink_parse_nat_setup+0xb6/0x640 net/netfilter/nf_conntrack_netlink.c:1521
 ctnetlink_setup_nat net/netfilter/nf_conntrack_netlink.c:1591 [inline]
 ctnetlink_create_conntrack+0x4b7/0x1280 net/netfilter/nf_conntrack_netlink.c:1984
 ctnetlink_new_conntrack+0x4f5/0xde0 net/netfilter/nf_conntrack_netlink.c:2114
 nfnetlink_rcv_msg+0xc9e/0xf4b net/netfilter/nfnetlink.c:228
 netlink_rcv_skb+0x160/0x410 net/netlink/af_netlink.c:2454
 nfnetlink_rcv+0x1b2/0x420 net/netfilter/nfnetlink.c:560
 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x4d7/0x6a0 net/netlink/af_netlink.c:1343
 netlink_sendmsg+0x80b/0xcd0 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:632
 ___sys_sendmsg+0x803/0x920 net/socket.c:2115
 __sys_sendmsg+0xec/0x1b0 net/socket.c:2153
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4401a9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd0414c948 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401a9
RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a30
R13: 0000000000401ac0 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace e6b2f385ce13ad47 ]---
RIP: 0010:nfnetlink_parse_nat net/netfilter/nf_nat_core.c:847 [inline]
RIP: 0010:nfnetlink_parse_nat_setup+0x21a/0x410 net/netfilter/nf_nat_core.c:884
Code: c3 89 c6 e8 f8 7f 95 fb 85 db 0f 88 72 01 00 00 e8 7b 7e 95 fb 49 8d 7e 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 d2 01 00 00 48 8b 7c 24 08 4c 89 fe 41 ff 56 38
RSP: 0018:ffff88808ffe71e0 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff85d21a38
RDX: 0000000000000007 RSI: ffffffff85d21a45 RDI: 000000000000003c
RBP: ffff8880a07ed040 R08: ffff888091d8c280 R09: ffff88808ffe7260
R10: ffffed1011ffce51 R11: ffff88808ffe728f R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000004 R15: ffff88808ffe7210
FS:  0000000000c0a880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000280 CR3: 0000000089508000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400