Backported from 5.5 for 5.4 by Remi Collet

From dcf3c9761c31e12011ba202f30caff53aae2056c Mon Sep 17 00:00:00 2001
From: Stanislav Malyshev <stas@php.net>
Date: Mon, 28 Dec 2015 14:46:35 -0800
Subject: [PATCH] Fixed bug #70661 (Use After Free Vulnerability in WDDX Packet
 Deserialization)

---
 NEWS                         |  2 ++
 ext/wddx/tests/bug70661.phpt | 69 ++++++++++++++++++++++++++++++++++++++++++++
 ext/wddx/wddx.c              |  2 +-
 3 files changed, 72 insertions(+), 1 deletion(-)
 create mode 100644 ext/wddx/tests/bug70661.phpt

diff --git a/ext/wddx/tests/bug70661.phpt b/ext/wddx/tests/bug70661.phpt
new file mode 100644
index 0000000..e068c20
--- /dev/null
+++ b/ext/wddx/tests/bug70661.phpt
@@ -0,0 +1,69 @@
+--TEST--
+Bug #70661 (Use After Free Vulnerability in WDDX Packet Deserialization)
+--SKIPIF--
+<?php
+if (!extension_loaded("wddx")) print "skip";
+?>
+--FILE--
+<?php
+$fakezval = ptr2str(1122334455);
+$fakezval .= ptr2str(0);
+$fakezval .= "\x00\x00\x00\x00";
+$fakezval .= "\x01";
+$fakezval .= "\x00";
+$fakezval .= "\x00\x00";
+
+$x = <<<EOT
+<?xml version='1.0'?>
+<wddxPacket version='1.0'>
+<header/>
+	<data>
+		<struct>
+			<recordset rowCount='1' fieldNames='ryat'>
+				<field name='ryat'>
+					<var name='php_class_name'>
+						<string>stdClass</string>
+					</var>
+					<null/>
+				</field>
+			</recordset>
+		</struct>	
+	</data>
+</wddxPacket>
+EOT;
+
+$y = wddx_deserialize($x);
+
+for ($i = 0; $i < 5; $i++) {
+	$v[$i] = $fakezval.$i;
+}
+
+var_dump($y);
+
+function ptr2str($ptr)
+{
+	$out = '';
+	
+	for ($i = 0; $i < 8; $i++) {
+		$out .= chr($ptr & 0xff);
+		$ptr >>= 8;
+	}
+	
+	return $out;
+}
+?>
+DONE
+--EXPECTF--
+array(1) {
+  [0]=>
+  array(1) {
+    ["ryat"]=>
+    array(2) {
+      ["php_class_name"]=>
+      string(8) "stdClass"
+      [0]=>
+      NULL
+    }
+  }
+}
+DONE
\ No newline at end of file
diff --git a/ext/wddx/wddx.c b/ext/wddx/wddx.c
index 8017620..b9dd1fa 100644
--- a/ext/wddx/wddx.c
+++ b/ext/wddx/wddx.c
@@ -978,7 +978,7 @@ static void php_wddx_pop_element(void *user_data, const XML_Char *name)
 
 				if (ent1->varname) {
 					if (!strcmp(ent1->varname, PHP_CLASS_NAME_VAR) &&
-						Z_TYPE_P(ent1->data) == IS_STRING && Z_STRLEN_P(ent1->data)) {
+						Z_TYPE_P(ent1->data) == IS_STRING && Z_STRLEN_P(ent1->data) && ent2->type == ST_STRUCT) {
 						zend_bool incomplete_class = 0;
 
 						zend_str_tolower(Z_STRVAL_P(ent1->data), Z_STRLEN_P(ent1->data));