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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.


---
There is no WARRANTY for the result, to the extent permitted by applicable  
law.
Except when otherwise stated in writing syzbot provides the result "AS IS"
without warranty of any kind, either expressed or implied, but not limited  
to,
the implied warranties of merchantability and fittness for a particular  
purpose.
The entire risk as to the quality of the result is with you. Should the  
result
prove defective, you assume the cost of all necessary servicing, repair or
correction.

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

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

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