netdev - divide error in nf_nat_l4proto_unique

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Message-ID: <94eb2c11bf824e1fe105651610c0@google.com>
Date:   Tue, 13 Feb 2018 03:12:00 -0800
From:   syzbot <syzbot+8012e198bd037f4871e5@...kaller.appspotmail.com>
To:     coreteam@...filter.org, davem@...emloft.net, fw@...len.de,
        kadlec@...ckhole.kfki.hu, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        pabeni@...hat.com, pablo@...filter.org,
        syzkaller-bugs@...glegroups.com
Subject: divide error in nf_nat_l4proto_unique_tuple

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger  
crash:

Reported-and-tested-by:  
syzbot+8012e198bd037f4871e5@...kaller.appspotmail.com

Note: the tag will also help syzbot to understand when the bug is fixed.

Tested on net commit
07a2e1cf398187814b405665b19d36425ec7a962 (Mon Feb 12 17:20:11 2018 +0000)
net: cavium: fix NULL pointer dereference in cavium_ptp_put

compiler: gcc (GCC) 7.1.1 20170620
Patch is attached.
Kernel config is attached.


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View attachment "patch.diff" of type "text/plain" (806 bytes)

View attachment "config.txt" of type "text/plain" (136427 bytes)