From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ulrich Weber Subject: [PATCH] nf_conntrack_sip: check for trailing spaces Date: Tue, 18 Oct 2016 11:13:18 +0200 Message-ID: <20161018091318.GA20644@gir> Mime-Version: 1.0 Return-path: Content-Disposition: inline Sender: netfilter-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: netfilter@vger.kernel.org Cc: kaber@trash.net on SIP requests, so a fragmented TCP SIP packet starting with INVITE,NOTIFY,OPTIONS,REFER,REGISTER,UPDATE,SUBSCRIBE Content-Length: 0 will not bet interpreted as an INVITE request. Confirm with RFC 3261 Request-Line = Method SP Request-URI SP SIP-Version CRLF Signed-off-by: Ulrich Weber --- net/netfilter/nf_conntrack_sip.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c index 7700556..e37f8da 100644 --- a/net/netfilter/nf_conntrack_sip.c +++ b/net/netfilter/nf_conntrack_sip.c @@ -1436,9 +1436,11 @@ static int process_sip_request(struct sk_buff *skb, unsigned int protoff, handler = &sip_handlers[i]; if (handler->request == NULL) continue; - if (*datalen < handler->len || + if (*datalen < handler->len + 1 || strncasecmp(*dptr, handler->method, handler->len)) continue; + if ((*dptr)[handler->len] != ' ') + continue; if (ct_sip_get_header(ct, *dptr, 0, *datalen, SIP_HDR_CSEQ, &matchoff, &matchlen) <= 0) { -- 2.7.4