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From e724879d964d774df9b7969fc846605aa1bac54c Mon Sep 17 00:00:00 2001
From: Daniel Veillard <veillard@redhat.com>
Date: Fri, 30 Oct 2015 21:14:55 +0800
Subject: [PATCH] Fix parsing short unclosed comment uninitialized access
For https://bugzilla.gnome.org/show_bug.cgi?id=746048
The HTML parser was too optimistic when processing comments and
didn't check for the end of the stream on the first 2 characters
Upstream-Status: Backport
https://git.gnome.org/browse/libxml2/commit/?id=e724879d964d774df9b7969fc846605aa1bac54c
CVE: CVE-2015-8710
Signed-off-by: Armin Kuster <akuster@mvista.com>
igned-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
---
HTMLparser.c | 21 ++++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)
Index: libxml2-2.9.2/HTMLparser.c
===================================================================
--- libxml2-2.9.2.orig/HTMLparser.c
+++ libxml2-2.9.2/HTMLparser.c
@@ -3245,12 +3245,17 @@ htmlParseComment(htmlParserCtxtPtr ctxt)
ctxt->instate = state;
return;
}
+ len = 0;
+ buf[len] = 0;
q = CUR_CHAR(ql);
+ if (!IS_CHAR(q))
+ goto unfinished;
NEXTL(ql);
r = CUR_CHAR(rl);
+ if (!IS_CHAR(r))
+ goto unfinished;
NEXTL(rl);
cur = CUR_CHAR(l);
- len = 0;
while (IS_CHAR(cur) &&
((cur != '>') ||
(r != '-') || (q != '-'))) {
@@ -3281,18 +3286,20 @@ htmlParseComment(htmlParserCtxtPtr ctxt)
}
}
buf[len] = 0;
- if (!IS_CHAR(cur)) {
- htmlParseErr(ctxt, XML_ERR_COMMENT_NOT_FINISHED,
- "Comment not terminated \n<!--%.50s\n", buf, NULL);
- xmlFree(buf);
- } else {
+ if (IS_CHAR(cur)) {
NEXT;
if ((ctxt->sax != NULL) && (ctxt->sax->comment != NULL) &&
(!ctxt->disableSAX))
ctxt->sax->comment(ctxt->userData, buf);
xmlFree(buf);
+ ctxt->instate = state;
+ return;
}
- ctxt->instate = state;
+
+unfinished:
+ htmlParseErr(ctxt, XML_ERR_COMMENT_NOT_FINISHED,
+ "Comment not terminated \n<!--%.50s\n", buf, NULL);
+ xmlFree(buf);
}
/**
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