netdev - KASAN: use-after-free Write in nf_nat_ipv6_manip

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Message-ID: <001a114f041044cf7505658783bf@google.com>
Date:   Sun, 18 Feb 2018 18:33:00 -0800
From:   syzbot <syzbot+10005f4292fc9cc89de7@...kaller.appspotmail.com>
To:     coreteam@...filter.org, davem@...emloft.net, fw@...len.de,
        kadlec@...ckhole.kfki.hu, kuznet@....inr.ac.ru,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, pablo@...filter.org,
        syzkaller-bugs@...glegroups.com, yoshfuji@...ux-ipv6.org
Subject: KASAN: use-after-free Write in nf_nat_ipv6_manip_pkt

Hello,

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

Reported-and-tested-by:  
syzbot+10005f4292fc9cc89de7@...kaller.appspotmail.com

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

Tested on git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git/master  
commit
de526f401284e1638d4c97cb5a4c292ac3f37655 (Mon Feb 12 16:11:48 2018 +0000)
netfilter: xt_hashlimit: fix lock imbalance

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" (460 bytes)

View attachment "config.txt" of type "text/plain" (136361 bytes)