creating and deleting of file and folder 'Shared' in root is not allowed

lib/private/connector/sabre/directory.php

@@ -50,6 +50,10 @@ class OC_Connector_Sabre_Directory extends OC_Connector_Sabre_Node implements Sa
 	 */
 	public function createFile($name, $data = null) {
 
+		if ($name === 'Shared' && empty($this->path)) {
+			throw new \Sabre_DAV_Exception_Forbidden();
+		}
+
 		// for chunked upload also updating a existing file is a "createFile"
 		// because we create all the chunks before reasamble them to the existing file.
 		if (isset($_SERVER['HTTP_OC_CHUNKED'])) {
@@ -82,6 +86,10 @@ class OC_Connector_Sabre_Directory extends OC_Connector_Sabre_Node implements Sa
 	 */
 	public function createDirectory($name) {
 
+		if ($name === 'Shared' && empty($this->path)) {
+			throw new \Sabre_DAV_Exception_Forbidden();
+		}
+
 		if (!\OC\Files\Filesystem::isCreatable($this->path)) {
 			throw new \Sabre_DAV_Exception_Forbidden();
 		}
@@ -187,13 +195,16 @@ class OC_Connector_Sabre_Directory extends OC_Connector_Sabre_Node implements Sa
 	 */
 	public function delete() {
 
-		if (!\OC\Files\Filesystem::isDeletable($this->path)) {
+		if ($this->path === 'Shared') {
 			throw new \Sabre_DAV_Exception_Forbidden();
 		}
-		if ($this->path != "/Shared") {
-			\OC\Files\Filesystem::rmdir($this->path);
+
+		if (!\OC\Files\Filesystem::isDeletable($this->path)) {
+			throw new \Sabre_DAV_Exception_Forbidden();
 		}
 
+		\OC\Files\Filesystem::rmdir($this->path);
+
 	}
 
 	/**

lib/private/connector/sabre/file.php

@@ -143,6 +143,10 @@ class OC_Connector_Sabre_File extends OC_Connector_Sabre_Node implements Sabre_D
 	 */
 	public function delete() {
 
+		if ($this->path === 'Shared') {
+			throw new \Sabre_DAV_Exception_Forbidden();
+		}
+
 		if (!\OC\Files\Filesystem::isDeletable($this->path)) {
 			throw new \Sabre_DAV_Exception_Forbidden();
 		}