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Fix GH-15570: Segmentation fault (access null pointer) in ext/dom/html5_serializer.c #15572

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Fix GH-15570: Segmentation fault (access null pointer) in ext/dom/html5_serializer.c #15572

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4 changes: 2 additions & 2 deletions ext/dom/html5_serializer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -137,8 +137,8 @@ static zend_result dom_html5_serialize_text_node(dom_html5_serialize_context *ct
return SUCCESS;
}

if (node->parent->type == XML_ELEMENT_NODE && php_dom_ns_is_fast(node->parent, php_dom_ns_is_html_magic_token)) {
const xmlNode *parent = node->parent;
const xmlNode *parent = node->parent;
if (parent != NULL && parent->type == XML_ELEMENT_NODE && php_dom_ns_is_fast(parent, php_dom_ns_is_html_magic_token)) {
size_t name_length = strlen((const char *) parent->name);
/* Spec tells us to only emit noscript content as-is if scripting is enabled.
* However, the user agent (PHP) does not support (JS) scripting.
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19 changes: 19 additions & 0 deletions ext/dom/tests/gh15570.phpt
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@@ -0,0 +1,19 @@
--TEST--
GH-15570 (Segmentation fault (access null pointer) in ext/dom/html5_serializer.c)
--CREDITS--
YuanchengJiang
--EXTENSIONS--
dom
--FILE--
<?php
$html = <<<HTML
<head>
</html>
HTML;
$dom = Dom\HTMLDocument::createFromString($html, LIBXML_NOERROR);
$a = $dom->head->firstChild->cloneNode(false);
var_dump($dom->saveHTML($a));
?>
--EXPECT--
string(1) "
"
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