libxml2: fix CVE-2017-8872

The htmlParseTryOrFinish function in HTMLparser.c in libxml2 2.9.4
allows attackers to cause a denial of service (buffer over-read) or
information disclosure.

https://bugzilla.gnome.org/show_bug.cgi?id=775200

(From OE-Core rev: dac867dc63af70ae992c50697d2be95c3e7b58bb)

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/libxml/libxml2/fix-CVE-2017-8872.patch

@@ -0,0 +1,38 @@
+From b4bee17b158e289e5c4c9045e64e5374ccafe068 Mon Sep 17 00:00:00 2001
+From: Salvatore Bonaccorso <carnil@debian.org>
+Date: Tue, 3 Jul 2018 15:54:03 +0800
+Subject: [PATCH] Out-of-bounds read in htmlParseTryOrFinish (CVE-2017-8872)
+
+https://bugzilla.gnome.org/show_bug.cgi?id=775200
+Fixes bug 775200.
+
+Signed-off-by: Salvatore Bonaccorso <carnil@debian.org>
+
+Upstream-Status: Submitted
+https://bug775200.bugzilla-attachments.gnome.org/attachment.cgi?id=366193
+CVE: CVE-2017-8872
+Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
+---
+ parser.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/parser.c b/parser.c
+index ca9fde2..fb4c889 100644
+--- a/parser.c
++++ b/parser.c
+@@ -12464,7 +12464,11 @@ xmlHaltParser(xmlParserCtxtPtr ctxt) {
+ 	}
+ 	ctxt->input->cur = BAD_CAST"";
+ 	ctxt->input->base = ctxt->input->cur;
+-        ctxt->input->end = ctxt->input->cur;
++	ctxt->input->end = ctxt->input->cur;
++	if (ctxt->input->buf)
++	    xmlBufEmpty (ctxt->input->buf->buffer);
++	else
++	    ctxt->input->length = 0;
+     }
+ }
+ 
+-- 
+2.7.4
+

meta/recipes-core/libxml/libxml2_2.9.8.bb

@@ -20,6 +20,7 @@ SRC_URI = "http://www.xmlsoft.org/sources/libxml2-${PV}.tar.gz;name=libtar \
            file://libxml-m4-use-pkgconfig.patch \
            file://0001-Make-ptest-run-the-python-tests-if-python-is-enabled.patch \
            file://fix-execution-of-ptests.patch \
+           file://fix-CVE-2017-8872.patch \
            "
 
 SRC_URI[libtar.md5sum] = "b786e353e2aa1b872d70d5d1ca0c740d"