general protection fault in hash_netport6_uadt

[syzbot]

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=10d79459e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=18698c0c240ba616
dashboard link: https://syzkaller.appspot.com/bug?extid=e2362b2c3f229b2c9447
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=161800d1e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+e2362b2c3f229b2c9447@xxxxxxxxxxxxxxxxxxxxxxxxx

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: 10079 Comm: syz-executor.0 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_netport6_uadt+0x21d/0xdb0  
net/netfilter/ipset/ip_set_hash_netport.c:382
Code: 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3a 09 00 00 4c 89  
f2 45 8b 7f 04 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c  
89 f0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ff
RSP: 0018:ffffc90002077160 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffc90002077320 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8680fd4a RDI: ffff8880a774f460
RBP: ffffc900020772b8 R08: 0000000000000000 R09: 0000000000000000
R10: ffffed1015d0703c R11: ffff8880ae8381e3 R12: ffff8880a28c6700
R13: ffffc900020771e0 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f34b39a8700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000a2b58000 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: 0033:0x45af49
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f34b39a7c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045af49
RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000007
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f34b39a86d4
R13: 00000000004c9e62 R14: 00000000004e2e98 R15: 00000000ffffffff
Modules linked in:
---[ end trace 7984c015f140cf61 ]---
RIP: 0010:hash_netport6_uadt+0x21d/0xdb0  
net/netfilter/ipset/ip_set_hash_netport.c:382
Code: 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3a 09 00 00 4c 89  
f2 45 8b 7f 04 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c  
89 f0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ff
RSP: 0018:ffffc90002077160 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffc90002077320 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8680fd4a RDI: ffff8880a774f460
RBP: ffffc900020772b8 R08: 0000000000000000 R09: 0000000000000000
R10: ffffed1015d0703c R11: ffff8880ae8381e3 R12: ffff8880a28c6700
R13: ffffc900020771e0 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f34b39a8700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000a2b58000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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