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Prevent errors, in SimpleXMLParser.onEndElement, when the stack has already been completely parsed (issue 10410)

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The error was triggered for a particular set of metadata, where an end tag was encountered without the corresponding begin tag being present in the data.
(The patch also fixes a minor oversight, from a recent PR, in the `SimpleDOMNode.nextSibling` method.)
This commit is contained in:
Jonas Jenwald 2019-01-04 11:37:44 +01:00
parent b39ec7af96
commit e8f4b47d59
2 changed files with 29 additions and 1 deletions
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8
src/display/xml_parser.js
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@ -287,6 +287,9 @@ class SimpleDOMNode {
return undefined;
}
const index = childNodes.indexOf(this);
if (index === -1) {
return undefined;
}
return childNodes[index + 1];
}
@ -364,8 +367,11 @@ class SimpleXMLParser extends XMLParserBase {
}
onEndElement(name) {
this._currentFragment = this._stack.pop();
this._currentFragment = this._stack.pop() || [];
const lastElement = this._currentFragment[this._currentFragment.length - 1];
if (!lastElement) {
return;
}
for (let i = 0, ii = lastElement.childNodes.length; i < ii; i++) {
lastElement.childNodes[i].parentNode = lastElement;
}

22
test/unit/metadata_spec.js
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@ -146,4 +146,26 @@ describe('metadata', function() {
expect(metadata.getAll()).toEqual({ 'dc:title': '\'Foo bar baz\'', });
});
it('should gracefully handle unbalanced end tags (issue 10410)', function() {
const data = '<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>' +
'<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">' +
'<rdf:Description rdf:about="" ' +
'xmlns:pdf="http://ns.adobe.com/pdf/1.3/">' +
'<pdf:Producer>Soda PDF 5</pdf:Producer></rdf:Description>' +
'<rdf:Description rdf:about="" ' +
'xmlns:xap="http://ns.adobe.com/xap/1.0/">' +
'<xap:CreateDate>2018-10-02T08:14:49-05:00</xap:CreateDate>' +
'<xap:CreatorTool>Soda PDF 5</xap:CreatorTool>' +
'<xap:MetadataDate>2018-10-02T08:14:49-05:00</xap:MetadataDate> ' +
'<xap:ModifyDate>2018-10-02T08:14:49-05:00</xap:ModifyDate>' +
'</rdf:Description><rdf:Description rdf:about="" ' +
'xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/">' +
'<xmpMM:DocumentID>uuid:00000000-1c84-3cf9-89ba-bef0e729c831' +
'</xmpMM:DocumentID></rdf:Description>' +
'</rdf:RDF></x:xmpmeta><?xpacket end="w"?>';
const metadata = new Metadata(data);
expect(isEmptyObj(metadata.getAll())).toEqual(true);
});
});