custom AdminUrl Fix without bc breaks

custom_adminurl_fix.patch

diff --git a/app/code/core/Mage/Adminhtml/controllers/IndexController.php b/app/code/core/Mage/Adminhtml/controllers/IndexController.php
index 5c786d5..b99705a 100644
--- a/app/code/core/Mage/Adminhtml/controllers/IndexController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/IndexController.php
@@ -75,6 +75,11 @@ class Mage_Adminhtml_IndexController extends Mage_Adminhtml_Controller_Action
             $this->_redirect('*');
             return;
         }
+        if (!in_Array(Mage::getConfig()->getNode(Mage_Adminhtml_Helper_Data::XML_PATH_ADMINHTML_ROUTER_FRONTNAME), explode(DS, $this->getRequest()->getRequestUri()))) {
+            $this->_redirect('cms/index/noRoute');
+            return;
+        }
+
         $loginData = $this->getRequest()->getParam('login');
         $username = (is_array($loginData) && array_key_exists('username', $loginData)) ? $loginData['username'] : null;