defect 652

saCkptCheckpointOpen segfaults if null parameter passed to checkpointHandle


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@716 fd59a12c-fef9-0310-b244-a6a79926bd2f

lib/ckpt.c

@@ -477,6 +477,10 @@ saCkptCheckpointOpen (
 	struct req_lib_ckpt_checkpointopen req_lib_ckpt_checkpointopen;
 	struct res_lib_ckpt_checkpointopen res_lib_ckpt_checkpointopen;
 
+	if (checkpointHandle == NULL) {
+		return (SA_AIS_ERR_INVALID_PARAM);
+	}
+
 	if ((checkpointOpenFlags & SA_CKPT_CHECKPOINT_CREATE) && 
 		checkpointCreationAttributes == NULL) {