Fix bug #68942 (Use after free vulnerability in unserialize() with DateTimeZone)

Conflicts:
	ext/date/php_date.c

Author: smalyshev

ext/date/php_date.c

@@ -2575,12 +2575,9 @@ static int php_date_initialize_from_hash(php_date_obj **dateobj, HashTable *myht
 	timelib_tzinfo   *tzi;
 	php_timezone_obj *tzobj;
 
-	if (zend_hash_find(myht, "date", 5, (void**) &z_date) == SUCCESS) {
-		convert_to_string(*z_date);
-		if (zend_hash_find(myht, "timezone_type", 14, (void**) &z_timezone_type) == SUCCESS) {
-			convert_to_long(*z_timezone_type);
-			if (zend_hash_find(myht, "timezone", 9, (void**) &z_timezone) == SUCCESS) {
-				convert_to_string(*z_timezone);
+	if (zend_hash_find(myht, "date", 5, (void**) &z_date) == SUCCESS && Z_TYPE_PP(z_date) == IS_STRING) {
+		if (zend_hash_find(myht, "timezone_type", 14, (void**) &z_timezone_type) == SUCCESS && Z_TYPE_PP(z_timezone_type) == IS_LONG) {
+			if (zend_hash_find(myht, "timezone", 9, (void**) &z_timezone) == SUCCESS && Z_TYPE_PP(z_timezone) == IS_STRING) {
 
 				switch (Z_LVAL_PP(z_timezone_type)) {
 					case TIMELIB_ZONETYPE_OFFSET:
@@ -2595,7 +2592,6 @@ static int php_date_initialize_from_hash(php_date_obj **dateobj, HashTable *myht
 
 					case TIMELIB_ZONETYPE_ID: {
 						int ret;
-						convert_to_string(*z_timezone);
 
 						tzi = php_date_parse_tzfile(Z_STRVAL_PP(z_timezone), DATE_TIMEZONEDB TSRMLS_CC);
 

ext/date/tests/bug68942_2.phpt

@@ -0,0 +1,9 @@
+--TEST--
+Bug #68942 (Use after free vulnerability in unserialize() with DateTime).
+--FILE--
+<?php
+$data = unserialize('a:2:{i:0;O:8:"DateTime":3:{s:4:"date";s:26:"2000-01-01 00:00:00.000000";s:13:"timezone_type";a:2:{i:0;i:1;i:1;i:2;}s:8:"timezone";s:1:"A";}i:1;R:5;}');
+var_dump($data);
+?>
+--EXPECTF--
+Fatal error: Invalid serialization data for DateTime object in %s/bug68942_2.php on line %d