netdev - Re: [PATCH] net: check the length of the data before dereferencing it

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Date:	Mon, 02 Apr 2012 05:59:14 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	xiaosuo@...il.com, kaber@...sh.net, pablo@...filter.org,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net: check the length of the data before dereferencing
 it

On Sun, 2012-04-01 at 23:57 -0400, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Mon, 02 Apr 2012 05:53:17 +0200
> 
> > On Mon, 2012-04-02 at 11:45 +0800, Changli Gao wrote:
> > 
> >> Thinking about a malformed tcp segment, which has no data but silly
> >> options, and whose last byte is neither TCPOPT_EOL or TCPOPT_NOP, we
> >> will try to dereference one byte over the boundary when parsing the
> >> options. I know we have skb_shared_info at the end and it won't cause
> >> any crash, but should we rely on this fact?
> >> 
> > 
> > No we cant rely on this, kmemcheck might barf on us.
> 
> Give me a break.

Sure. End of discussion.


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