Ticket #16057: 16057.diff

wp-admin/includes/file.php

@@ -537 +537 @@
                 return new WP_Error('http_404', trim($response['response']['message']));
         }
 
-        fwrite($handle, $response['body']);
+        $result = fwrite($handle, $response['body']);
         fclose($handle);
 
+        if ( false === $result || is_int($result) && $result < strlen($response['body']) )
+                return new WP_Error('http_cannot_write', __('Could not write to the temporary file. There may not be enough diskspace.') );
+
         return $tmpfname;
 }