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

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Date:	Thu, 1 Mar 2012 11:21:36 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	santosh nayak <santoshprasadnayak@...il.com>
Cc:	bart.de.schuymer@...dora.be, kaber@...sh.net,
	shemminger@...tta.com, davem@...emloft.net,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, bridge@...ts.linux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 2/3] netfilter: potential null derefence.

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.
> 
> Signed-off-by: Santosh Nayak <santoshprasadnayak@...il.com>
> ---
>  net/bridge/netfilter/ebtables.c |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
> 
> diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
> index f3fcbd9..9c0f177 100644
> --- a/net/bridge/netfilter/ebtables.c
> +++ b/net/bridge/netfilter/ebtables.c
> @@ -209,8 +209,10 @@ unsigned int ebt_do_table (unsigned int hook, struct sk_buff *skb,
>  	   smp_processor_id());
>  	if (private->chainstack)
>  		cs = private->chainstack[smp_processor_id()];
> -	else
> +	else {
>  		cs = NULL;
> +		goto out;

There is no "out" label in ebt_do_table !!
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