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

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Message-Id: <20120402.001429.145178038621256162.davem@davemloft.net>
Date:	Mon, 02 Apr 2012 00:14:29 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
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

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 02 Apr 2012 05:58:25 +0200

> 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.

That's perfectly fine and would document the situation.  And we can
add a similar annotation to the two other nearly identical pieces of
code in net/netfilter/nf_conntrack_proto_tcp.c
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