netdev - Re: [PATCH iproute2 v2] ss: avoid passing negative numbers to malloc

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Date:	Wed, 13 Nov 2013 06:16:17 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andreas Henriksson <andreas@...al.se>
Cc:	stephen@...workplumber.org, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2 v2] ss: avoid passing negative numbers to malloc

On Wed, 2013-11-13 at 09:46 +0100, Andreas Henriksson wrote:
> Example:
> 
> $ ss state established \( sport = :4060  or sport = :4061 or sport = :4062  or sport = :4063 or sport = :4064  or sport = :4065 or sport = :4066  or sport = :4067 \)  > /dev/null
> Aborted
> 
> In the example above ssfilter_bytecompile(...) will return (int)136.
> char l1 = 136; means -120 which will result in a negative number
> being passed to malloc at misc/ss.c:913.
> 
> Simply declare l1 and l2 as integers to avoid the char overflow.
> 
> This is one of the issues originally reported in http://bugs.debian.org/511720
> 
> Fix the same problem in other code paths as well (thanks to Eric Dumazet).
> 
> Reported-by: Andreas Schuldei <andreas@...ian.org>
> Signed-off-by: Andreas Henriksson <andreas@...al.se>

Reviewed-by: Eric Dumazet <edumazet@...gle.com>

Thanks !


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