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Fix GH-16151: Assertion failure in ext/dom/parentnode/tree.c #16156

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Fix GH-16151: Assertion failure in ext/dom/parentnode/tree.c #16156

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73 changes: 35 additions & 38 deletions ext/dom/node.c
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Original file line number Diff line number Diff line change
Expand Up @@ -843,6 +843,39 @@ static xmlNodePtr _php_dom_insert_fragment(xmlNodePtr nodep, xmlNodePtr prevsib,
}
/* }}} */

static bool dom_node_check_legacy_insertion_validity(xmlNodePtr parentp, xmlNodePtr child, bool stricterror)
{
if (dom_node_is_read_only(parentp) == SUCCESS ||
(child->parent != NULL && dom_node_is_read_only(child->parent) == SUCCESS)) {
php_dom_throw_error(NO_MODIFICATION_ALLOWED_ERR, stricterror);
return false;
}

if (dom_hierarchy(parentp, child) == FAILURE) {
php_dom_throw_error(HIERARCHY_REQUEST_ERR, stricterror);
return false;
}

if (child->doc != parentp->doc && child->doc != NULL) {
php_dom_throw_error(WRONG_DOCUMENT_ERR, stricterror);
return false;
}

if (child->type == XML_DOCUMENT_FRAG_NODE && child->children == NULL) {
/* TODO Drop Warning? */
php_error_docref(NULL, E_WARNING, "Document Fragment is empty");
return false;
}

/* In old DOM only text nodes can be added as children to attributes. */
if (parentp->type == XML_ATTRIBUTE_NODE && child->type != XML_TEXT_NODE && child->type != XML_ENTITY_REF_NODE) {
php_dom_throw_error(HIERARCHY_REQUEST_ERR, stricterror);
return false;
}

return true;
}

/* {{{ URL: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#core-ID-952280727
Since:
*/
Expand Down Expand Up @@ -870,25 +903,7 @@ PHP_METHOD(DOMNode, insertBefore)

stricterror = dom_get_strict_error(intern->document);

if (dom_node_is_read_only(parentp) == SUCCESS ||
(child->parent != NULL && dom_node_is_read_only(child->parent) == SUCCESS)) {
php_dom_throw_error(NO_MODIFICATION_ALLOWED_ERR, stricterror);
RETURN_FALSE;
}

if (dom_hierarchy(parentp, child) == FAILURE) {
php_dom_throw_error(HIERARCHY_REQUEST_ERR, stricterror);
RETURN_FALSE;
}

if (child->doc != parentp->doc && child->doc != NULL) {
php_dom_throw_error(WRONG_DOCUMENT_ERR, stricterror);
RETURN_FALSE;
}

if (child->type == XML_DOCUMENT_FRAG_NODE && child->children == NULL) {
/* TODO Drop Warning? */
php_error_docref(NULL, E_WARNING, "Document Fragment is empty");
if (!dom_node_check_legacy_insertion_validity(parentp, child, stricterror)) {
RETURN_FALSE;
}

Expand Down Expand Up @@ -1170,25 +1185,7 @@ PHP_METHOD(DOMNode, appendChild)

stricterror = dom_get_strict_error(intern->document);

if (dom_node_is_read_only(nodep) == SUCCESS ||
(child->parent != NULL && dom_node_is_read_only(child->parent) == SUCCESS)) {
php_dom_throw_error(NO_MODIFICATION_ALLOWED_ERR, stricterror);
RETURN_FALSE;
}

if (dom_hierarchy(nodep, child) == FAILURE) {
php_dom_throw_error(HIERARCHY_REQUEST_ERR, stricterror);
RETURN_FALSE;
}

if (!(child->doc == NULL || child->doc == nodep->doc)) {
php_dom_throw_error(WRONG_DOCUMENT_ERR, stricterror);
RETURN_FALSE;
}

if (child->type == XML_DOCUMENT_FRAG_NODE && child->children == NULL) {
/* TODO Drop Warning? */
php_error_docref(NULL, E_WARNING, "Document Fragment is empty");
if (!dom_node_check_legacy_insertion_validity(nodep, child, stricterror)) {
RETURN_FALSE;
}

Expand Down
35 changes: 35 additions & 0 deletions ext/dom/tests/gh16151.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,35 @@
--TEST--
GH-16151 (Assertion failure in ext/dom/parentnode/tree.c)
--EXTENSIONS--
dom
--FILE--
<?php

$element = new DOMElement("N", "W", "y");
$attr = new DOMAttr("c" , "n");
$doc = new DOMDocument();
$doc->appendChild($element);
$element->setAttributeNodeNS($attr);

try {
$attr->insertBefore(new DOMComment("h"));
} catch (DOMException $e) {
echo $e->getMessage(), "\n";
}
try {
$attr->appendChild(new DOMComment("h"));
} catch (DOMException $e) {
echo $e->getMessage(), "\n";
}

$attr->insertBefore($doc->createEntityReference('amp'));
$attr->appendChild($doc->createEntityReference('amp'));

echo $doc->saveXML();

?>
--EXPECT--
Hierarchy Request Error
Hierarchy Request Error
<?xml version="1.0"?>
<N xmlns="y" c="n&amp;&amp;">W</N>
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