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

[Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>]

On Thu, Mar 01, 2012 at 02:47:14PM +0530, santosh nayak wrote:
> From: Santosh Nayak <santoshprasadnayak@xxxxxxxxx>
> 
> 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@xxxxxxxxx>
> ---
>  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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