Index: channels/sip/reqresp_parser.c
===================================================================
--- channels/sip/reqresp_parser.c	(revision 279471)
+++ channels/sip/reqresp_parser.c	(working copy)
@@ -1993,6 +1993,11 @@
 	addr1_parsed = ast_sockaddr_parse(&addr1, host1, 0);
 	addr2_parsed = ast_sockaddr_parse(&addr2, host2, 0);
 
+	if (!addr1_parsed || !addr2_parsed) {
+		/* ast_sockaddr_parse() return an error. FAIL! */
+		return 1;
+	}
+
 	if (addr1_parsed != addr2_parsed) {
 		/* One domain was an IP address and the other had
 		 * a host name. FAIL!