From fc7cd35c817a12eff7dd875a97cf0fe892ec3522 Mon Sep 17 00:00:00 2001
From: Petr Skoda <commits@skodak.org>
Date: Sun, 17 Jul 2011 20:36:12 +0200
Subject: [PATCH] MDL-28348 prevent circular references in meta handler for
 enrolments

---
 enrol/meta/locallib.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/enrol/meta/locallib.php b/enrol/meta/locallib.php
index 3b68e7f40f69b..0f94daeee322e 100644
--- a/enrol/meta/locallib.php
+++ b/enrol/meta/locallib.php
@@ -128,6 +128,11 @@ public function user_enrolled($ue) {
             return true;
         }
 
+        if ($ue->enrol === 'meta') {
+            // prevent circular dependencies - we can not sync meta enrolments recursively
+            return true;
+        }
+
         // does anything want to sync with this parent?
         if (!$enrols = $DB->get_records('enrol', array('customint1'=>$ue->courseid, 'enrol'=>'meta'), 'id ASC')) {
             return true;