We should only check directories for being writable

application/controllers/Debug.php

@@ -52,10 +52,12 @@ class Debug extends CI_Controller {
             // Check if the subdirectories are writable (recursive check)
             $iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path));
             foreach ($iterator as $item) {
-                if (!is_writable($item->getPathname())) {
+               if ($item->isDir() && basename($item->getPathName()) != '..') {
+                  if (!is_writable($item->getRealPath())) {
                      return false;
                   }
                }
+            }
 
             return true;
         }