fixes possible segfault in domxml_xslt_result_dump_mem

diff --git a/ext/domxml/php_domxml.c b/ext/domxml/php_domxml.c
index f55ede7d12d6d04b91c8d81ebf835ad92340eb14..01fc2ddfa772876346eafaeaaa878aff4fc30fd7 100644 (file)
--- a/ext/domxml/php_domxml.c
+++ b/ext/domxml/php_domxml.c
@@ -5592,8 +5592,12 @@ PHP_FUNCTION(domxml_xslt_result_dump_mem)
                RETURN_FALSE;
        }
 
-       RETVAL_STRINGL(doc_txt_ptr, doc_txt_len, 1);
-       xmlFree(doc_txt_ptr);
+       if (doc_txt_ptr) {
+               RETVAL_STRINGL(doc_txt_ptr, doc_txt_len, 1);
+               xmlFree(doc_txt_ptr);
+       } else {
+               RETURN_EMPTY_STRING();
+       }
 }
 /* }}} */