From 88be50bf3939003b7146f49cf9bce092daa9d4b9 Mon Sep 17 00:00:00 2001
From: Benjamin Eberlei <kontakt@beberlei.de>
Date: Sat, 15 Aug 2020 10:52:04 +0200
Subject: [PATCH] Fix #79968: Manipulation on unattached DOMChildNode should
 throw DOMException

---
 ext/dom/parentnode.c        |  5 +++++
 ext/dom/tests/bug79968.phpt | 17 +++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 ext/dom/tests/bug79968.phpt

diff --git a/ext/dom/parentnode.c b/ext/dom/parentnode.c
index a7627cb84c1c..f47416edff3d 100644
--- a/ext/dom/parentnode.c
+++ b/ext/dom/parentnode.c
@@ -134,6 +134,11 @@ xmlNode* dom_zvals_to_fragment(php_libxml_ref_obj *document, xmlNode *contextNod
 	dom_object *newNodeObj;
 	int stricterror;
 
+	if (document == NULL) {
+		php_dom_throw_error(HIERARCHY_REQUEST_ERR, 1);
+		return NULL;
+	}
+
 	if (contextNode->type == XML_DOCUMENT_NODE || contextNode->type == XML_HTML_DOCUMENT_NODE) {
 		documentNode = (xmlDoc *) contextNode;
 	} else {
diff --git a/ext/dom/tests/bug79968.phpt b/ext/dom/tests/bug79968.phpt
new file mode 100644
index 000000000000..45107351a4eb
--- /dev/null
+++ b/ext/dom/tests/bug79968.phpt
@@ -0,0 +1,17 @@
+--TEST--
+dom: Bug #79968 - Crash when calling before without valid hierachy
+--SKIPIF--
+<?php require_once('skipif.inc'); ?>
+--FILE--
+<?php
+
+$cdata = new DOMText;
+
+try {
+    $cdata->before("string");
+} catch (DOMException $e) {
+    echo $e->getMessage();
+}
+?>
+--EXPECT--
+Hierarchy Request Error