libxml2: CVE-2015-8317

Fixes out-of-bounds heap read when parsing file with unfinished
xml declaration.

Reference:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8317

Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
Signed-off-by: Tudor Florea <tudor.florea@enea.com>

2 files changed, 43 insertions, 0 deletions

diff --git a/meta/recipes-core/libxml/libxml2.inc b/meta/recipes-core/libxml/libxml2.inc
index 2dafeb446d..2dc4d575f6 100644
--- a/meta/recipes-core/libxml/libxml2.inc
+++ b/meta/recipes-core/libxml/libxml2.inc
@@ -26,6 +26,7 @@ SRC_URI = "ftp://xmlsoft.org/libxml2/libxml2-${PV}.tar.gz;name=libtar \
            file://CVE-2015-7942.patch \
            file://CVE-2015-8035.patch \
            file://CVE-2015-8241.patch \
+           file://CVE-2015-8317-Fail-parsing-early-on-if-encoding-conversion-failed.patch \
           "
 
 BINCONFIG = "${bindir}/xml2-config"
diff --git a/meta/recipes-core/libxml/libxml2/CVE-2015-8317-Fail-parsing-early-on-if-encoding-conversion-failed.patch b/meta/recipes-core/libxml/libxml2/CVE-2015-8317-Fail-parsing-early-on-if-encoding-conversion-failed.patch
new file mode 100644
index 0000000000..a5eee02bc2
--- /dev/null
+++ b/meta/recipes-core/libxml/libxml2/CVE-2015-8317-Fail-parsing-early-on-if-encoding-conversion-failed.patch
@@ -0,0 +1,42 @@
+From 709a952110e98621c9b78c4f26462a9d8333102e Mon Sep 17 00:00:00 2001
+From: Daniel Veillard <veillard@redhat.com>
+Date: Mon, 29 Jun 2015 16:10:26 +0800
+Subject: [PATCH] Fail parsing early on if encoding conversion failed
+
+For https://bugzilla.gnome.org/show_bug.cgi?id=751631
+
+If we fail conversing the current input stream while
+processing the encoding declaration of the XMLDecl
+then it's safer to just abort there and not try to
+report further errors.
+
+Upstream-Status: Backport
+
+CVE: CVE-2015-8317
+
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ parser.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/parser.c b/parser.c
+index a3a9568..0edd53b 100644
+--- a/parser.c
++++ b/parser.c
+@@ -10471,7 +10471,11 @@ xmlParseEncodingDecl(xmlParserCtxtPtr ctxt) {
+ 
+             handler = xmlFindCharEncodingHandler((const char *) encoding);
+            if (handler != NULL) {
+-               xmlSwitchToEncoding(ctxt, handler);
++               if (xmlSwitchToEncoding(ctxt, handler) < 0) {
++                   /* failed to convert */
++                   ctxt->errNo = XML_ERR_UNSUPPORTED_ENCODING;
++                   return(NULL);
++               }
+            } else {
+                xmlFatalErrMsgStr(ctxt, XML_ERR_UNSUPPORTED_ENCODING,
+                        "Unsupported encoding %s\n", encoding);
+-- 
+2.3.5
+