linux-kernel - Re: [Bridge] [PATCH 2/3] netfilter: potential null derefence.

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Date:	Sat, 3 Mar 2012 10:11:53 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Bart De Schuymer <bdschuym@...dora.be>
Cc:	santosh nayak <santoshprasadnayak@...il.com>,
	netfilter@...r.kernel.org, coreteam@...filter.org,
	netdev@...r.kernel.org, bridge@...ts.linux-foundation.org,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	davem@...emloft.net, bart.de.schuymer@...dora.be,
	netfilter-devel@...r.kernel.org, shemminger@...tta.com
Subject: Re: [Bridge] [PATCH 2/3] netfilter: potential null derefence.

On Fri, Mar 02, 2012 at 10:31:23PM +0100, Bart De Schuymer wrote:
> Op 1/03/2012 13:30, Pablo Neira Ayuso schreef:
> >On Thu, Mar 01, 2012 at 02:47:14PM +0530, santosh nayak wrote:
> >>From: Santosh Nayak<santoshprasadnayak@...il.com>
> >>
> >>I am getting following error.
> >>" net/bridge/netfilter/ebtables.c:269 ebt_do_table()
> >>   error: potential null derefence 'cs'"
> >>
> >>     i = cs[sp].n;  // If cs == Null then this will cause problem.
> >
> >Very sorry, I didn't see the out label.
> >
> >I'll apply this to my nf [1] once David takes my previous request for
> >pulling.
> >
> 
> Hi,
> 
> Has this patch been tested? Really, that code in the core firewall
> function is there for a reason, wouldn't you think?
> The chainstack is only allocated when user-defined chains are used
> (see translate_table).
> Never blindly trust a tool.

I see, then that cs NULL dereference never happens.

Thanks Bart, I'll drop this patch.
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