From 4cb8ca186097de43e48c1d99f83f30704313dab3 Mon Sep 17 00:00:00 2001
From: Robin Appelman <icewind@owncloud.com>
Date: Fri, 28 Aug 2015 20:48:42 +0200
Subject: [PATCH] Check result of storage wrappers

---
 lib/private/files/storage/storagefactory.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/private/files/storage/storagefactory.php b/lib/private/files/storage/storagefactory.php
index 62b393c845..e8df5090f0 100644
--- a/lib/private/files/storage/storagefactory.php
+++ b/lib/private/files/storage/storagefactory.php
@@ -99,6 +99,9 @@ class StorageFactory implements IStorageFactory {
 		}, $wrappers);
 		foreach ($wrappers as $wrapper) {
 			$storage = $wrapper($mountPoint->getMountPoint(), $storage, $mountPoint);
+			if (!($storage instanceof \OCP\Files\Storage)) {
+				throw new \Exception('Invalid result from storage wrapper');
+			}
 		}
 		return $storage;
 	}