res_pjsip: Check return from pjsip_parse_uri calls

Updated ast_sip_create_rdata_with_contact and registrar_find_contact
to check the return from pjsip_parse_uri before attempting to
use the uri returned.

ASTERISK-28402
Reported-by: Ross Beer

Change-Id: I9810b3b163c45ed5a56ec743586e5ce107f13ba7

res/res_pjsip.c

@@ -3741,6 +3741,10 @@ int ast_sip_create_rdata_with_contact(pjsip_rx_data *rdata, char *packet, const
 		if (contact_hdr) {
 			contact_hdr->uri = pjsip_parse_uri(rdata->tp_info.pool, (char *)contact,
 				strlen(contact), PJSIP_PARSE_URI_AS_NAMEADDR);
+			if (!contact_hdr->uri) {
+				ast_log(LOG_WARNING, "Unable to parse contact URI from '%s'.\n", contact);
+				return -1;
+			}
 		}
 	}
 

res/res_pjsip_registrar.c

@@ -129,6 +129,10 @@ static int registrar_find_contact(void *obj, void *arg, int flags)
 	}
 
 	contact_uri = pjsip_parse_uri(details->pool, (char*)contact->uri, strlen(contact->uri), 0);
+	if (!contact_uri) {
+		ast_log(LOG_WARNING, "Unable to parse contact URI from '%s'.\n", contact->uri);
+		return 0;
+	}
 
 	return (pjsip_uri_cmp(PJSIP_URI_IN_CONTACT_HDR, details->uri, contact_uri) == PJ_SUCCESS) ? CMP_MATCH : 0;
 }