From a3f05d640d73d61c1978446adb1217f40356d037 Mon Sep 17 00:00:00 2001
From: Xinchen Hui <laruence@php.net>
Date: Fri, 10 Jul 2015 15:27:06 +0800
Subject: [PATCH] Fixed Issue #1400 (double free static property)

---
 Zend/zend_inheritance.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Zend/zend_inheritance.c b/Zend/zend_inheritance.c
index 64e7407f12..9b96a4a479 100644
--- a/Zend/zend_inheritance.c
+++ b/Zend/zend_inheritance.c
@@ -821,7 +821,13 @@ ZEND_API void zend_do_inheritance(zend_class_entry *ce, zend_class_entry *parent
 		do {
 			dst--;
 			src--;
-			ZVAL_MAKE_REF(src);
+			if (parent_ce->type == ZEND_INTERNAL_CLASS) {
+				if (!Z_ISREF_P(src)) {
+					ZVAL_NEW_PERSISTENT_REF(src, src);
+				}
+			} else {
+				ZVAL_MAKE_REF(src);
+			}
 			ZVAL_COPY_VALUE(dst, src);
 			Z_ADDREF_P(dst);
 			if (Z_CONSTANT_P(Z_REFVAL_P(dst))) {
-- 
2.50.1