From 05648dac619942dfccc76180d30fcd79364355ec Mon Sep 17 00:00:00 2001
From: Michael Gapczynski <mtgap@owncloud.com>
Date: Wed, 8 Aug 2012 11:25:24 -0400
Subject: [PATCH] Don't return file handle if the mode supports writing and
 the file is not writable

---
 apps/files_sharing/sharedstorage.php |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

Index: owncloud-4.0.5debian2/apps/files_sharing/sharedstorage.php
===================================================================
--- owncloud-4.0.5debian2.orig/apps/files_sharing/sharedstorage.php	2012-07-19 18:50:49.000000000 +0200
+++ owncloud-4.0.5debian2/apps/files_sharing/sharedstorage.php	2012-08-09 11:29:58.000000000 +0200
@@ -416,6 +416,25 @@
 	public function fopen($path, $mode) {
 		$source = $this->getSource($path);
 		if ($source) {
+                       switch ($mode) {
+                               case 'r+':
+                               case 'rb+':
+                               case 'w+':
+                               case 'wb+':
+                               case 'x+':
+                               case 'xb+':
+                               case 'a+':
+                               case 'ab+':
+                               case 'w':
+                               case 'wb':
+                               case 'x':
+                               case 'xb':
+                               case 'a':
+                               case 'ab':
+                                       if (!$this->is_writable($path)) {
+                                               return false;
+                                       }
+                       }
 			$storage = OC_Filesystem::getStorage($source);
 			return $storage->fopen($this->getInternalPath($source), $mode);
 		}