libxslt: add patch for CVE-2015-7995

(cherry picked from commit 45d1abef)

Change-Id: I733cd21f6d8c7ea1e01f594d1483ad9c2043c188
Reviewed-on: https://gerrit.libreoffice.org/20094Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

external/libxslt/0001-Fix-for-type-confusion-in-preprocessing-attributes.patch.1

+From 7ca19df892ca22d9314e95d59ce2abdeff46b617 Mon Sep 17 00:00:00 2001
+From: Daniel Veillard <veillard@redhat.com>
+Date: Thu, 29 Oct 2015 19:33:23 +0800
+Subject: [PATCH] Fix for type confusion in preprocessing attributes
+
+CVE-2015-7995 http://www.openwall.com/lists/oss-security/2015/10/27/10
+We need to check that the parent node is an element before dereferencing
+its namespace
+---
+ libxslt/preproc.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/libxslt/preproc.c b/libxslt/preproc.c
+index 0eb80a0..7f69325 100644
+--- a/libxslt/preproc.c
++++ b/libxslt/preproc.c
+@@ -2249,7 +2249,8 @@ xsltStylePreCompute(xsltStylesheetPtr style, xmlNodePtr inst) {
+ 	} else if (IS_XSLT_NAME(inst, "attribute")) {
+ 	    xmlNodePtr parent = inst->parent;
+ 
+-	    if ((parent == NULL) || (parent->ns == NULL) ||
++	    if ((parent == NULL) ||
++	        (parent->type != XML_ELEMENT_NODE) || (parent->ns == NULL) ||
+ 		((parent->ns != inst->ns) &&
+ 		 (!xmlStrEqual(parent->ns->href, inst->ns->href))) ||
+ 		(!xmlStrEqual(parent->name, BAD_CAST "attribute-set"))) {
+-- 
+2.4.3
+

external/libxslt/UnpackedTarball_xslt.mk

@@ -21,6 +21,7 @@ $(eval $(call gb_UnpackedTarball_add_patches,xslt,\
 	$(if $(filter ANDROID,$(OS)),external/libxslt/libxslt-android.patch) \
 	external/libxslt/libxslt-config-guess.patch.0 \
 	external/libxslt/rpath.patch.0 \
+	external/libxslt/0001-Fix-for-type-confusion-in-preprocessing-attributes.patch.1 \
 ))
 
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