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Date:   Wed, 8 Jan 2020 17:05:53 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+19df0457b3f8383e02bd@...kaller.appspotmail.com>
Cc:     coreteam@...filter.org, David Miller <davem@...emloft.net>,
        Florian Westphal <fw@...len.de>,
        "Enrico Weigelt, metux IT consult" <info@...ux.net>,
        jeremy@...zel.net, kadlec@...filter.org,
        Kate Stewart <kstewart@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        NetFilter <netfilter-devel@...r.kernel.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: general protection fault in hash_ipportip6_uadt

On Wed, Jan 8, 2020 at 5:04 PM syzbot
<syzbot+19df0457b3f8383e02bd@...kaller.appspotmail.com> wrote:
>
> 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=17a8e885e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=18698c0c240ba616
> dashboard link: https://syzkaller.appspot.com/bug?extid=19df0457b3f8383e02bd
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11ccdf51e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=123dd5fee00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+19df0457b3f8383e02bd@...kaller.appspotmail.com

#syz dup: general protection fault in hash_ipportnet4_uadt

> 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: 9515 Comm: syz-executor397 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_ipportip6_uadt+0x226/0xa00
> net/netfilter/ipset/ip_set_hash_ipportip.c:285
> Code: 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 14 07 00 00 4c 89
> ea 45 8b 76 04 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c
> 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 d9
> RSP: 0018:ffffc90001d07170 EFLAGS: 00010246
> RAX: dffffc0000000000 RBX: ffffc90001d07320 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffffffff867d0153 RDI: ffff888094d55430
> RBP: ffffc90001d072b8 R08: 0000000000000000 R09: 0000000000000000
> R10: ffffed1015d0703c R11: ffff8880ae8381e3 R12: ffff8880a6f34c00
> R13: 0000000000000000 R14: 0000000004000000 R15: 0000000000000002
> FS:  0000000001348880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000180 CR3: 00000000a2c54000 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: 0033:0x441469
> Code: e8 fc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007ffe390fa778 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441469
> RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000003
> RBP: 00000000000166ea R08: 00000000004002c8 R09: 00000000004002c8
> R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402290
> R13: 0000000000402320 R14: 0000000000000000 R15: 0000000000000000
> Modules linked in:
> ---[ end trace 12a892406cf2adb8 ]---
> RIP: 0010:hash_ipportip6_uadt+0x226/0xa00
> net/netfilter/ipset/ip_set_hash_ipportip.c:285
> Code: 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 14 07 00 00 4c 89
> ea 45 8b 76 04 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c
> 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 d9
> RSP: 0018:ffffc90001d07170 EFLAGS: 00010246
> RAX: dffffc0000000000 RBX: ffffc90001d07320 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffffffff867d0153 RDI: ffff888094d55430
> RBP: ffffc90001d072b8 R08: 0000000000000000 R09: 0000000000000000
> R10: ffffed1015d0703c R11: ffff8880ae8381e3 R12: ffff8880a6f34c00
> R13: 0000000000000000 R14: 0000000004000000 R15: 0000000000000002
> FS:  0000000001348880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000180 CR3: 00000000a2c54000 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@...glegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches
>
> --
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