Ensure that purify isn't applied twice for an already purified SafeString

1 files changed, 5 insertions, 1 deletions

diff --git a/modules/gallery/libraries/SafeString.php b/modules/gallery/libraries/SafeString.php
index 800647fa..e6f54add 100644
--- a/modules/gallery/libraries/SafeString.php
+++ b/modules/gallery/libraries/SafeString.php
@@ -51,7 +51,11 @@ class SafeString_Core {
    */
   static function purify($string) {
     if ($string instanceof SafeString) {
-      $string = $string->unescaped();
+      if ($string->_is_purified_html) {
+        return $string;
+      } else {
+        $string = $string->unescaped();
+      }
     }
     $safe_string = self::of_safe_html(self::_purify_for_html($string));
     $safe_string->_is_purified_html = true;