From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vlad Yasevich Subject: Re: [PATCH] sctp: verify length provided in heartbeat information parameter Date: Fri, 30 Nov 2012 12:34:12 -0500 Message-ID: <50B8EE14.7050804@gmail.com> References: <20121130121627.GG30697@casper.infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: davem@davemloft.net, netdev@vger.kernel.org, linux-sctp@vger.kernel.org To: Thomas Graf Return-path: Received: from mail-da0-f46.google.com ([209.85.210.46]:55810 "EHLO mail-da0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757288Ab2K3ReT (ORCPT ); Fri, 30 Nov 2012 12:34:19 -0500 In-Reply-To: <20121130121627.GG30697@casper.infradead.org> Sender: netdev-owner@vger.kernel.org List-ID: On 11/30/2012 07:16 AM, 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 Acked-by: Vlad Yasevich -vlad > --- > 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 netdev" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >