files: storage: rename should check parent directories of old and new files

as described by POSIX.1-2008
(see http://pubs.opengroup.org/onlinepubs/9699919799/functions/rename.html)

Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>

lib/private/files/storage/local.php

@@ -172,10 +172,19 @@ if (\OC_Util::runningOnWindows()) {
 		}
 
 		public function rename($path1, $path2) {
-			if (!$this->isUpdatable($path1)) {
-				\OC_Log::write('core', 'unable to rename, file is not writable : ' . $path1, \OC_Log::ERROR);
+			$srcParent = dirname($path1);
+			$dstParent = dirname($path2);
+
+			if (!$this->isUpdatable($srcParent)) {
+				\OC_Log::write('core', 'unable to rename, source directory is not writable : ' . $srcParent, \OC_Log::ERROR);
 				return false;
 			}
+
+			if (!$this->isUpdatable($dstParent)) {
+				\OC_Log::write('core', 'unable to rename, destination directory is not writable : ' . $dstParent, \OC_Log::ERROR);
+				return false;
+			}
+
 			if (!$this->file_exists($path1)) {
 				\OC_Log::write('core', 'unable to rename, file does not exists : ' . $path1, \OC_Log::ERROR);
 				return false;

lib/private/files/storage/mappedlocal.php

@@ -184,10 +184,19 @@ class MappedLocal extends \OC\Files\Storage\Common {
 	}
 
 	public function rename($path1, $path2) {
-		if (!$this->isUpdatable($path1)) {
-			\OC_Log::write('core', 'unable to rename, file is not writable : ' . $path1, \OC_Log::ERROR);
+		$srcParent = dirname($path1);
+		$dstParent = dirname($path2);
+
+		if (!$this->isUpdatable($srcParent)) {
+			\OC_Log::write('core', 'unable to rename, source directory is not writable : ' . $srcParent, \OC_Log::ERROR);
 			return false;
 		}
+
+		if (!$this->isUpdatable($dstParent)) {
+			\OC_Log::write('core', 'unable to rename, destination directory is not writable : ' . $dstParent, \OC_Log::ERROR);
+			return false;
+		}
+
 		if (!$this->file_exists($path1)) {
 			\OC_Log::write('core', 'unable to rename, file does not exists : ' . $path1, \OC_Log::ERROR);
 			return false;