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Subjectgeneral protection fault in hash_netport4_uadt
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Hello,

syzbot found the following crash on:

HEAD commit: ae608821 Merge tag 'trace-v5.5-rc5' of git://git.kernel.or..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13cd963ee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=18698c0c240ba616
dashboard link: https://syzkaller.appspot.com/bug?extid=83fef78f45f4342655d8
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17ac4076e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16f582aee00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+83fef78f45f4342655d8@syzkaller.appspotmail.com

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
CPU: 0 PID: 9442 Comm: syz-executor534 Not tainted 5.5.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:hash_netport4_uadt+0x218/0xff0
net/netfilter/ipset/ip_set_hash_netport.c:166
Code: 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 4d 0a 00 00 4c 89
e2 45 8b 6d 04 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c
89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 4c
RSP: 0018:ffffc90001e07160 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffc90001e07320 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff86811235 RDI: ffff888097483030
RBP: ffffc90001e072b8 R08: 0000000000000000 R09: 0000000000000000
R10: ffffed1015d0703c R11: ffff8880ae8381e3 R12: 0000000000000000
R13: 0000000004000000 R14: ffffc90001e07220 R15: 0000000000000002
FS: 0000000002029880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000f86 CR3: 000000009d29d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ip_set_utest+0x55b/0x890 net/netfilter/ipset/ip_set_core.c:1867
nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229
netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563
netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
netlink_unicast+0x58c/0x7d0 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:639 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:659
____sys_sendmsg+0x753/0x880 net/socket.c:2330
___sys_sendmsg+0x100/0x170 net/socket.c:2384
__sys_sendmsg+0x105/0x1d0 net/socket.c:2417
__do_sys_sendmsg net/socket.c:2426 [inline]
__se_sys_sendmsg net/socket.c:2424 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2424
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4405e9
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:00007ffed104de78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004405e9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 0000000000000024 R09: 00000000004002c8
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000401e70
R13: 0000000000401f00 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 0f2c9f8c52df08d8 ]---
RIP: 0010:hash_netport4_uadt+0x218/0xff0
net/netfilter/ipset/ip_set_hash_netport.c:166
Code: 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 4d 0a 00 00 4c 89
e2 45 8b 6d 04 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c
89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 4c
RSP: 0018:ffffc90001e07160 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffc90001e07320 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff86811235 RDI: ffff888097483030
RBP: ffffc90001e072b8 R08: 0000000000000000 R09: 0000000000000000
R10: ffffed1015d0703c R11: ffff8880ae8381e3 R12: 0000000000000000
R13: 0000000004000000 R14: ffffc90001e07220 R15: 0000000000000002
FS: 0000000002029880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000f86 CR3: 000000009d29d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
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syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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