libxml2: Security fix CVE-2015-8710

CVE-2015-8710 libxml2: out-of-bounds memory access when parsing an unclosed HTML comment

(From OE-Core rev: 03d481070ebc6f9af799aec5d038871f9c73901c)

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 72 insertions, 0 deletions

diff --git a/meta/recipes-core/libxml/libxml2.inc b/meta/recipes-core/libxml/libxml2.inc
index bced950fa9..310d5bbc56 100644
--- a/meta/recipes-core/libxml/libxml2.inc
+++ b/meta/recipes-core/libxml/libxml2.inc
@@ -36,6 +36,7 @@ SRC_URI = "ftp://xmlsoft.org/libxml2/libxml2-${PV}.tar.gz;name=libtar \
            file://0001-CVE-2015-8242-Buffer-overead-with-HTML-parser-in-pus.patch \
            file://0001-CVE-2015-5312-Another-entity-expansion-issue.patch \
            file://CVE-2015-8241.patch \
+           file://CVE-2015-8710.patch \
           "
 
 BINCONFIG = "${bindir}/xml2-config"
diff --git a/meta/recipes-core/libxml/libxml2/CVE-2015-8710.patch b/meta/recipes-core/libxml/libxml2/CVE-2015-8710.patch
new file mode 100644
index 0000000000..be06cc22c8
--- /dev/null
+++ b/meta/recipes-core/libxml/libxml2/CVE-2015-8710.patch
@@ -0,0 +1,71 @@
+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>
+
+---
+ 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);
+ }
+ 
+ /**