defect 682

null iovector caues checkpointRead to segfault



git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@737 fd59a12c-fef9-0310-b244-a6a79926bd2f

lib/ckpt.c

@@ -1475,6 +1475,10 @@ saCkptCheckpointRead (
 	int i;
 	struct iovec iov[3];
 
+	if (ioVector == NULL) {
+		return (SA_AIS_ERR_INVALID_PARAM);
+	}
+
 	error = saHandleInstanceGet (&checkpointHandleDatabase, checkpointHandle,
 		(void *)&ckptCheckpointInstance);
 	if (error != SA_AIS_OK) {