From b0719c36a9a5340adb9a7cbabe0b486b215dee1f Mon Sep 17 00:00:00 2001
From: Michael Wallner <mike@php.net>
Date: Sun, 2 Apr 2006 21:51:01 +0000
Subject: [PATCH] - Disallow $HttpMessage->prepend($HttpMessage) causing
 infinite recursion

---
 http_message_object.c | 16 ++++++++++++++++
 package2.xml          |  1 +
 2 files changed, 17 insertions(+)

diff --git a/http_message_object.c b/http_message_object.c
index 7069e6a..a04438b 100644
--- a/http_message_object.c
+++ b/http_message_object.c
@@ -1417,6 +1417,8 @@ PHP_METHOD(HttpMessage, detach)
  * Prepends message(s) to the HTTP message.
  *
  * Expects an HttpMessage object as parameter.
+ *
+ * Throws HttpInvalidParamException if the messages are located within the same message chain.
  */
 PHP_METHOD(HttpMessage, prepend)
 {
@@ -1424,6 +1426,20 @@ PHP_METHOD(HttpMessage, prepend)
 	zend_bool top = 1;
 	
 	if (SUCCESS == zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "O|b", &prepend, http_message_object_ce, &top)) {
+		http_message *msg[2];
+		getObject(http_message_object, obj);
+		getObjectEx(http_message_object, prepend_obj, prepend);
+		
+		/* safety check */
+		for (msg[0] = obj->message; msg[0]; msg[0] = msg[0]->parent) {
+			for (msg[1] = prepend_obj->message; msg[1]; msg[1] = msg[1]->parent) {
+				if (msg[0] == msg[1]) {
+					http_error(HE_THROW, HTTP_E_INVALID_PARAM, "Cannot prepend a message located within the same message chain");
+					return;
+				}
+			}
+		}
+		
 		http_message_object_prepend_ex(getThis(), prepend, top);
 	}
 }
diff --git a/package2.xml b/package2.xml
index 84a78d8..892f1c8 100644
--- a/package2.xml
+++ b/package2.xml
@@ -47,6 +47,7 @@ HttpResponse
  <license>BSD, revised</license>
  <notes><![CDATA[
 - Improved performance of the message and header parser
+- Disallow $HttpMessage->prepend($HttpMessage) causing infinite recursion
 * Fixed internal http_parse_headers() always returning success
 * Fixed missing "parentMessage" entry in print_r($HttpMessageObject)
 ]]></notes>
-- 
2.30.2