[Asterisk-cvs] asterisk rtp.c,1.103,1.104

[markster at lists.digium.com]

Update of /usr/cvsroot/asterisk
In directory mongoose.digium.com:/tmp/cvs-serv12918

Modified Files:
	rtp.c 
Log Message:
Ignore invalid RTP packets (bug #3030)


Index: rtp.c
===================================================================
RCS file: /usr/cvsroot/asterisk/rtp.c,v
retrieving revision 1.103
retrieving revision 1.104
diff -u -d -r1.103 -r1.104
--- rtp.c	28 Dec 2004 16:43:20 -0000	1.103
+++ rtp.c	28 Dec 2004 16:45:03 -0000	1.104
@@ -427,6 +427,7 @@
 	struct sockaddr_in sin;
 	int len;
 	unsigned int seqno;
+	int version;
 	int payloadtype;
 	int hdrlen = 12;
 	int mark;
@@ -477,6 +478,12 @@
 
 	/* Get fields */
 	seqno = ntohl(rtpheader[0]);
+
+	/* Check RTP version */
+	version = (seqno & 0xC0000000) >> 30;
+	if (version != 2)
+		return &null_frame;
+	
 	payloadtype = (seqno & 0x7f0000) >> 16;
 	mark = seqno & (1 << 23);
 	ext = seqno & (1 << 28);