Merge branch 'PHP-7.1' into PHP-7.2

* PHP-7.1:
  Fixed bug #75002 Null Pointer Dereference in timelib_time_clone

Author: weltling

ext/date/php_date.c

@@ -1962,6 +1962,10 @@ static void date_period_it_rewind(zend_object_iterator *iter)
 	if (iterator->object->current) {
 		timelib_time_dtor(iterator->object->current);
 	}
+	if (!iterator->object->start) {
+		zend_throw_error(NULL, "DatePeriod has not been initialized correctly");
+		return;
+	}
 	iterator->object->current = timelib_time_clone(iterator->object->start);
 	date_period_it_invalidate_current(iter);
 }

ext/date/tests/bug75002.phpt

@@ -0,0 +1,22 @@
+--TEST--
+Bug #75002 Null Pointer Dereference in timelib_time_clone
+--FILE--
+<?php
+
+class aaa extends DatePeriod {
+	public function __construct() { }
+}
+
+$start=new DateTime( '2012-08-01' );
+
+foreach (new aaa($start) as $y) {
+	$a=$key;
+}
+
+?>
+==DONE==
+--EXPECTF--	
+Fatal error: Uncaught Error: DatePeriod has not been initialized correctly in %sbug75002.php:%d
+Stack trace:
+#0 {main}
+  thrown in %sbug75002.php on line %d