From 112527d67798b6e18ed1c639e66d8cff674dcfd8 Mon Sep 17 00:00:00 2001
From: Remi Collet <remi@php.net>
Date: Tue, 3 Aug 2021 12:06:36 +0200
Subject: [PATCH] Fix bug #81325  Segfault in zif_simplexml_import_dom

---
 ext/simplexml/simplexml.c         |  2 +-
 ext/simplexml/tests/bug81325.phpt | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 ext/simplexml/tests/bug81325.phpt

diff --git a/ext/simplexml/simplexml.c b/ext/simplexml/simplexml.c
index 4ed41d758762..21e1190e681b 100644
--- a/ext/simplexml/simplexml.c
+++ b/ext/simplexml/simplexml.c
@@ -2635,7 +2635,7 @@ PHP_FUNCTION(simplexml_import_dom)
 		nodep = xmlDocGetRootElement((xmlDocPtr) nodep);
 	}
 
-	if (nodep->type == XML_ELEMENT_NODE) {
+	if (nodep && nodep->type == XML_ELEMENT_NODE) {
 		if (!ce) {
 			ce = sxe_class_entry;
 			fptr_count = NULL;
diff --git a/ext/simplexml/tests/bug81325.phpt b/ext/simplexml/tests/bug81325.phpt
new file mode 100644
index 000000000000..b4010dd1f0c3
--- /dev/null
+++ b/ext/simplexml/tests/bug81325.phpt
@@ -0,0 +1,19 @@
+--TEST--
+BUg #81325 (segfault in zif_simplexml_import_dom)
+--SKIPIF--
+<?php
+if (!extension_loaded('simplexml')) die('skip simplexml not available');
+if (!extension_loaded('dom')) die('skip simplexml not available');
+?>
+--FILE--
+<?php
+$dom = new DOMDocument;
+$dom->loadXML("foo");
+$xml = simplexml_import_dom($dom);
+?>
+Done
+--EXPECTF--
+Warning: DOMDocument::loadXML(): Start tag expected%s
+
+Warning: simplexml_import_dom(): Invalid Nodetype%s
+Done