From: Kevin P. Fleming <kpfleming@digium.com>
Date: Wed, 12 Mar 2008 19:16:07 +0000 (+0000)
Subject: if we receive an INVITE with a Content-Length that is not a valid number, or is zero... 
X-Git-Tag: 1.4.19-rc3~24
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=988e55c13f264d06cf72bdc0fc474e96d64abe8c;p=thirdparty%2Fasterisk.git

if we receive an INVITE with a Content-Length that is not a valid number, or is zero, then don't process the rest of the message body looking for an SDP

closes issue #11475
Reported by: andrebarbosa



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@108086 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 113fe95185..cf8a78e949 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -4856,6 +4856,7 @@ static void parse_request(struct sip_request *req)
 static int find_sdp(struct sip_request *req)
 {
 	const char *content_type;
+	const char *content_length;
 	const char *search;
 	char *boundary;
 	unsigned int x;
@@ -4863,6 +4864,20 @@ static int find_sdp(struct sip_request *req)
 	int found_application_sdp = FALSE;
 	int found_end_of_headers = FALSE;
 
+	content_length = get_header(req, "Content-Length");
+
+	if (!ast_strlen_zero(content_length)) {
+		if (sscanf(content_length, "%ud", &x) != 1) {
+			ast_log(LOG_WARNING, "Invalid Content-Length: %s\n", content_length);
+			return 0;
+		}
+
+		/* Content-Length of zero means there can't possibly be an
+		   SDP here, even if the Content-Type says there is */
+		if (x == 0)
+			return 0;
+	}
+
 	content_type = get_header(req, "Content-Type");
 
 	/* if the body contains only SDP, this is easy */