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

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Message-ID: <1333339105.2325.6622.camel@edumazet-glaptop>
Date:	Mon, 02 Apr 2012 05:58:25 +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 23:55 -0400, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Mon, 02 Apr 2012 05:45:45 +0200
> 
> > Usually not a problem since we have many bytes after our head.
> 
> We always have bytes after the head, it's guarenteed, and whether it's
> garbage bytes or skb_shared_info() it simply doesn't matter.

Then you have to add a kmemcheck_something() to make this clear and
avoid possible warnings.




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