From 2104c2ffdd4fb2f63c4150bd2ffd0ac35d5ea859 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20M=C3=BCller?= <thomas.mueller@tmit.eu>
Date: Mon, 1 Jun 2015 14:10:00 +0200
Subject: [PATCH] Fixing undefined index 'foo'

---
 lib/private/lock/memcachelockingprovider.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/private/lock/memcachelockingprovider.php b/lib/private/lock/memcachelockingprovider.php
index 26957f8ced..3f32ab1d8c 100644
--- a/lib/private/lock/memcachelockingprovider.php
+++ b/lib/private/lock/memcachelockingprovider.php
@@ -111,6 +111,9 @@ class MemcacheLockingProvider implements ILockingProvider {
 				throw new LockedException($path);
 			}
 			unset($this->acquiredLocks['exclusive'][$path]);
+			if (!isset($this->acquiredLocks['shared'][$path])) {
+				$this->acquiredLocks['shared'][$path] = 0;
+			}
 			$this->acquiredLocks['shared'][$path]++;
 		} else if ($targetType === self::LOCK_EXCLUSIVE) {
 			// we can only change a shared lock to an exclusive if there's only a single owner of the shared lock