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commit 3018042fd3c11c3d6cda36b3cbae4f7bb4f20c3d
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Author: Pranjal Jumde <pjumde@apple.com>
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Date: Tue Mar 1 11:34:04 2016 -0800
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Bug 758605: Heap-based buffer overread in xmlDictAddString <https://bugzilla.gnome.org/show_bug.cgi?id=758605>
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Reviewed by David Kilzer.
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* HTMLparser.c:
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(htmlParseName): Add bounds check.
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(htmlParseNameComplex): Ditto.
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* result/HTML/758605.html: Added.
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* result/HTML/758605.html.err: Added.
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* result/HTML/758605.html.sax: Added.
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* runtest.c:
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(pushParseTest): The input for the new test case was so small
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(4 bytes) that htmlParseChunk() was never called after
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htmlCreatePushParserCtxt(), thereby creating a false positive
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test failure. Fixed by using a do-while loop so we always call
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htmlParseChunk() at least once.
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* test/HTML/758605.html: Added.
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diff --git a/HTMLparser.c b/HTMLparser.c
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index 4331d53..a897cb0 100644
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--- a/HTMLparser.c
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+++ b/HTMLparser.c
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@@ -2471,6 +2471,10 @@ htmlParseName(htmlParserCtxtPtr ctxt) {
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(*in == '_') || (*in == '-') ||
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(*in == ':') || (*in == '.'))
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in++;
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+
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+ if (in == ctxt->input->end)
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+ return(NULL);
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+
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if ((*in > 0) && (*in < 0x80)) {
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count = in - ctxt->input->cur;
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ret = xmlDictLookup(ctxt->dict, ctxt->input->cur, count);
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@@ -2514,6 +2518,10 @@ htmlParseNameComplex(xmlParserCtxtPtr ctxt) {
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NEXTL(l);
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c = CUR_CHAR(l);
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}
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+
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+ if (ctxt->input->base > ctxt->input->cur - len)
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+ return(NULL);
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+
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return(xmlDictLookup(ctxt->dict, ctxt->input->cur - len, len));
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}
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diff --git a/result/HTML/758605.html b/result/HTML/758605.html
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new file mode 100644
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index 0000000..a085cce
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--- /dev/null
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+++ b/result/HTML/758605.html
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@@ -0,0 +1,3 @@
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
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+<html><body><p>&
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+</p></body></html>
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diff --git a/result/HTML/758605.html.err b/result/HTML/758605.html.err
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new file mode 100644
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index 0000000..2b82be6
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--- /dev/null
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+++ b/result/HTML/758605.html.err
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@@ -0,0 +1,3 @@
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+./test/HTML/758605.html:1: HTML parser error : htmlParseEntityRef: no name
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+ê
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+ ^
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diff --git a/result/HTML/758605.html.sax b/result/HTML/758605.html.sax
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new file mode 100644
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index 0000000..1f5cd32
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--- /dev/null
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+++ b/result/HTML/758605.html.sax
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@@ -0,0 +1,13 @@
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+SAX.setDocumentLocator()
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+SAX.startDocument()
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+SAX.error: htmlParseEntityRef: no name
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+SAX.startElement(html)
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+SAX.startElement(body)
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+SAX.startElement(p)
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+SAX.characters(&, 1)
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+SAX.ignorableWhitespace(
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+, 1)
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+SAX.endElement(p)
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+SAX.endElement(body)
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+SAX.endElement(html)
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+SAX.endDocument()
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diff --git a/runtest.c b/runtest.c
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index ccdd49b..0afa788 100644
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--- a/runtest.c
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+++ b/runtest.c
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@@ -1824,7 +1824,7 @@ pushParseTest(const char *filename, const char *result,
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ctxt = xmlCreatePushParserCtxt(NULL, NULL, base + cur, 4, filename);
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xmlCtxtUseOptions(ctxt, options);
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cur += 4;
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- while (cur < size) {
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+ do {
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if (cur + 1024 >= size) {
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#ifdef LIBXML_HTML_ENABLED
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if (options & XML_PARSE_HTML)
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@@ -1842,7 +1842,7 @@ pushParseTest(const char *filename, const char *result,
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xmlParseChunk(ctxt, base + cur, 1024, 0);
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cur += 1024;
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}
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- }
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+ } while (cur < size);
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doc = ctxt->myDoc;
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#ifdef LIBXML_HTML_ENABLED
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if (options & XML_PARSE_HTML)
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diff --git a/test/HTML/758605.html b/test/HTML/758605.html
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new file mode 100644
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index 0000000..9b1b3c2
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--- /dev/null
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+++ b/test/HTML/758605.html
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@@ -0,0 +1 @@
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+&:<EFBFBD>
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