Merge pull request #1665 from owncloud/fix_ldap_1605

LDAP: format dn before using it, not other way round. fixes #1605

apps/user_ldap/lib/access.php

@@ -57,8 +57,8 @@ abstract class Access {
 			\OCP\Util::writeLog('user_ldap', 'LDAP resource not available.', \OCP\Util::DEBUG);
 			return false;
 		}
-		$rr = @ldap_read($cr, $dn, $filter, array($attr));
 		$dn = $this->DNasBaseParameter($dn);
+		$rr = @ldap_read($cr, $dn, $filter, array($attr));
 		if(!is_resource($rr)) {
 			\OCP\Util::writeLog('user_ldap', 'readAttribute failed for DN '.$dn, \OCP\Util::DEBUG);
 			//in case an error occurs , e.g. object does not exist