netdev - Re: Null pointer dereference in icmp

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Message-ID: <BANLkTinNeK1KVv8L-+ySgG-nfhg1=eiUPg@mail.gmail.com>
Date:	Tue, 17 May 2011 09:31:28 +0200
From:	Aristide Fattori <joystick@...urity.dico.unimi.it>
To:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	roberto.paleari@...ze.net
Subject: Re: Null pointer dereference in icmp_send

Hi Eric,

On Mon, May 16, 2011 at 11:38 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le lundi 16 mai 2011 à 23:27 +0200, Eric Dumazet a écrit :
>> You forgot to tell us which linux version you used ?

Sorry about that, we verified the bug in versions 2.6.38.3, 2.6.38.4
and 2.6.38.6, but we didn't check the svn version :-)

> ...
> But if a timeout occurs, we take first queued fragment to build one ICMP
> TIME EXCEEDED message. Problem is all queued skb have weak dst pointers,
> ...

At a first glance, it appears we identified the same bug you already
fixed. If you want to double check, we can send you the "long version
report" that we submitted at first to security@...nel.org and
david@...emloft.net.

> It is scheduled for linux-2.6.38 stable tree as well

Good job! :-)

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