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Fix GH-15551: Segmentation fault (access null pointer) in ext/dom/xml_common.h #15556

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Fix GH-15551: Segmentation fault (access null pointer) in ext/dom/xml_common.h #15556

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6 changes: 4 additions & 2 deletions ext/dom/dom_iterators.c
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Original file line number Diff line number Diff line change
Expand Up @@ -184,13 +184,15 @@ static void php_dom_iterator_move_forward(zend_object_iterator *iter) /* {{{ */
bool do_curobj_undef = 1;

php_dom_iterator *iterator = (php_dom_iterator *)iter;
if (Z_ISUNDEF(iterator->curobj)) {
return;
}

intern = Z_DOMOBJ_P(&iterator->curobj);
object = &iterator->intern.data;
nnmap = Z_DOMOBJ_P(object);
objmap = (dom_nnodemap_object *)nnmap->ptr;

intern = Z_DOMOBJ_P(&iterator->curobj);

if (intern != NULL && intern->ptr != NULL) {
if (objmap->nodetype != XML_ENTITY_NODE &&
objmap->nodetype != XML_NOTATION_NODE) {
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14 changes: 14 additions & 0 deletions ext/dom/tests/gh15551.phpt
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@@ -0,0 +1,14 @@
--TEST--
GH-15551 (Segmentation fault (access null pointer) in ext/dom/xml_common.h)
--EXTENSIONS--
dom
--FILE--
<?php
$fragment = new DOMDocumentFragment();
$nodes = $fragment->childNodes;
$iter = $nodes->getIterator();
$iter->next();
var_dump($iter->valid());
?>
--EXPECT--
bool(false)
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