netdev - Re: [PATCH] sctp: verify length provided in heartbeat information parameter

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Date:	Fri, 30 Nov 2012 11:01:57 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-sctp@...r.kernel.org
Subject: Re: [PATCH] sctp: verify length provided in heartbeat information
 parameter

On Fri, Nov 30, 2012 at 12:16:27PM +0000, Thomas Graf wrote:
> If the variable parameter length provided in the mandatory
> heartbeat information parameter exceeds the calculated payload
> length the packet has been corrupted. Reply with a parameter
> length protocol violation message.
> 
> Signed-off-by: Thomas Graf <tgraf@...g.ch>
> ---
>  net/sctp/sm_statefuns.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
> index b6adef8..e92079d 100644
> --- a/net/sctp/sm_statefuns.c
> +++ b/net/sctp/sm_statefuns.c
> @@ -1055,6 +1055,7 @@ sctp_disposition_t sctp_sf_beat_8_3(struct net *net,
>  				    void *arg,
>  				    sctp_cmd_seq_t *commands)
>  {
> +	sctp_paramhdr_t *param_hdr;
>  	struct sctp_chunk *chunk = arg;
>  	struct sctp_chunk *reply;
>  	size_t paylen = 0;
> @@ -1072,12 +1073,17 @@ sctp_disposition_t sctp_sf_beat_8_3(struct net *net,
>  	 * Information field copied from the received HEARTBEAT chunk.
>  	 */
>  	chunk->subh.hb_hdr = (sctp_heartbeathdr_t *) chunk->skb->data;
> +	param_hdr = (sctp_paramhdr_t *) chunk->subh.hb_hdr;
>  	paylen = ntohs(chunk->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
> +
> +	if (ntohs(param_hdr->length) > paylen)
> +		return sctp_sf_violation_paramlen(net, ep, asoc, type, arg,
> +						  param_hdr, commands);
> +
>  	if (!pskb_pull(chunk->skb, paylen))
>  		goto nomem;
>  
> -	reply = sctp_make_heartbeat_ack(asoc, chunk,
> -					chunk->subh.hb_hdr, paylen);
> +	reply = sctp_make_heartbeat_ack(asoc, chunk, param_hdr, paylen);
>  	if (!reply)
>  		goto nomem;
>  
> --
> To unsubscribe from this list: send the line "unsubscribe linux-sctp" in
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> 
Looks good, thanks Thomas.
Acked-by: Neil Horman <nhorman@...driver.com>

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