Internet Bug Bounty: wddx_deserialize null dereference in php_wddx_pop_element

Upstream Bug --- https://bugs.php.net/bug.php?id=72799 Summary -- If we add an element to boolean leaf of XML struct, a null pointer dereference will happen when the element is popped. Source code: https://github.com/php/php-src/blob/PHP-5.6.24/ext/wddx/wddx.cL985 static void phpwddxpopelementvoi...