defect 790

if sectionDescriptor is null in iteration next call, segfault occurs


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@783 fd59a12c-fef9-0310-b244-a6a79926bd2f

lib/ckpt.c

@@ -1328,6 +1328,10 @@ saCkptSectionIterationNext (
 	struct res_lib_ckpt_sectioniteratornext res_lib_ckpt_sectioniteratornext;
 	struct iteratorSectionIdListEntry *iteratorSectionIdListEntry;
 
+	if (sectionDescriptor == NULL) {
+		return (SA_AIS_ERR_INVALID_PARAM);
+	}
+
 	error = saHandleInstanceGet (&ckptSectionIterationHandleDatabase,
 		sectionIterationHandle, (void *)&ckptSectionIterationInstance);
 	if (error != SA_AIS_OK) {