[OE-core] [PATCH 6/7] libxml2: Fix CVE-2017-0663

[Andrej Valek]

Fix type confusion in xmlValidateOneNamespace

Comment out code that casts xmlNsPtr to xmlAttrPtr. ID types
on namespace declarations make no practical sense anyway.

Fixes bug 780228

CVE: CVE-2017-0663
Signed-off-by: Andrej Valek <andrej.valek at siemens.com>
---
 .../libxml/libxml2/libxml2-CVE-2017-0663.patch     | 40 ++++++++++++++++++++++
 meta/recipes-core/libxml/libxml2_2.9.4.bb          |  1 +
 2 files changed, 41 insertions(+)
 create mode 100644 meta/recipes-core/libxml/libxml2/libxml2-CVE-2017-0663.patch

diff --git a/meta/recipes-core/libxml/libxml2/libxml2-CVE-2017-0663.patch b/meta/recipes-core/libxml/libxml2/libxml2-CVE-2017-0663.patch
new file mode 100644
index 0000000..66eeb82
--- /dev/null
+++ b/meta/recipes-core/libxml/libxml2/libxml2-CVE-2017-0663.patch
@@ -0,0 +1,40 @@
+libxml2-2.9.4: Fix CVE-2017-0663
+
+[No upstream tracking] -- https://bugzilla.gnome.org/show_bug.cgi?id=780228
+
+valid: Fix type confusion in xmlValidateOneNamespace
+
+Comment out code that casts xmlNsPtr to xmlAttrPtr. ID types
+on namespace declarations make no practical sense anyway.
+
+Fixes bug 780228
+
+Upstream-Status: Backported [https://git.gnome.org/browse/libxml2/commit/?id=92b9e8c8b3787068565a1820ba575d042f9eec66]
+CVE: CVE-2017-0663
+Signed-off-by: Andrej Valek <andrej.valek at siemens.com>
+
+diff --git a/libxml2-2.9.4/valid.c b/libxml2-2.9.4/valid.c
+index 19f84b8..e03d35e 100644
+--- a/valid.c
++++ b/valid.c
+@@ -4621,6 +4621,12 @@ xmlNodePtr elem, const xmlChar *prefix, xmlNsPtr ns, const xmlChar *value) {
+ 	}
+     }
+ 
++    /*
++     * Casting ns to xmlAttrPtr is wrong. We'd need separate functions
++     * xmlAddID and xmlAddRef for namespace declarations, but it makes
++     * no practical sense to use ID types anyway.
++     */
++#if 0
+     /* Validity Constraint: ID uniqueness */
+     if (attrDecl->atype == XML_ATTRIBUTE_ID) {
+         if (xmlAddID(ctxt, doc, value, (xmlAttrPtr) ns) == NULL)
+@@ -4632,6 +4638,7 @@ xmlNodePtr elem, const xmlChar *prefix, xmlNsPtr ns, const xmlChar *value) {
+         if (xmlAddRef(ctxt, doc, value, (xmlAttrPtr) ns) == NULL)
+ 	    ret = 0;
+     }
++#endif
+ 
+     /* Validity Constraint: Notation Attributes */
+     if (attrDecl->atype == XML_ATTRIBUTE_NOTATION) {
diff --git a/meta/recipes-core/libxml/libxml2_2.9.4.bb b/meta/recipes-core/libxml/libxml2_2.9.4.bb
index 2996809..677d8c9 100644
--- a/meta/recipes-core/libxml/libxml2_2.9.4.bb
+++ b/meta/recipes-core/libxml/libxml2_2.9.4.bb
@@ -27,6 +27,7 @@ SRC_URI = "ftp://xmlsoft.org/libxml2/libxml2-${PV}.tar.gz;name=libtar \
            file://libxml2-CVE-2017-9047_CVE-2017-9048.patch \
            file://libxml2-CVE-2017-9049_CVE-2017-9050.patch \
            file://libxml2-CVE-2017-5969.patch \
+           file://libxml2-CVE-2017-0663.patch \
            file://CVE-2016-9318.patch \
            file://0001-Make-ptest-run-the-python-tests-if-python-is-enabled.patch \
            "
-- 
2.1.4