netdev - KASAN: use-after-free Read in pppol2tp

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Message-ID: <f403045d9c206f034b0565b5dd5c@google.com>
Date:   Wed, 21 Feb 2018 01:51:02 -0800
From:   syzbot <syzbot+9df43faf09bd400f2993@...kaller.appspotmail.com>
To:     davem@...emloft.net, jchapman@...alix.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: KASAN: use-after-free Read in pppol2tp_connect

Hello,

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

Reported-and-tested-by:  
syzbot+9df43faf09bd400f2993@...kaller.appspotmail.com

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

Tested on  
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/master commit
5ae437ad5a2ed573b1ebb04e0afa70b8869f88dd (Mon Feb 19 20:32:51 2018 +0000)
net: sched: report if filter is too large to dump

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" (5987 bytes)

View attachment "config.txt" of type "text/plain" (136511 bytes)