From 717b480a2e50e43f6f51159d2e680219c2bf4acf Mon Sep 17 00:00:00 2001
From: Bjoern Schiessle <bjoern@schiessle.org>
Date: Mon, 4 Jul 2016 11:00:50 +0200
Subject: [PATCH] add additional check if we have a valid uid and filename

---
 apps/files_versions/lib/storage.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/apps/files_versions/lib/storage.php b/apps/files_versions/lib/storage.php
index cf99f62b8328d..d8fd9bfc316df 100644
--- a/apps/files_versions/lib/storage.php
+++ b/apps/files_versions/lib/storage.php
@@ -321,6 +321,10 @@ public static function rollback($file, $revision) {
 			// add expected leading slash
 			$file = '/' . ltrim($file, '/');
 			list($uid, $filename) = self::getUidAndFilename($file);
+			if ($uid === null || trim($filename, '/') === '') {
+				return false;
+			}
+
 			$users_view = new View('/'.$uid);
 			$files_view = new View('/'. User::getUser().'/files');
 			$versionCreated = false;