gentoo-overlay/dev-libs/libxml2/files/libxml2-2.9.4-CVE-2017-0663.patch

From d815758b6a8c9dee8155268e49b5ef3b80135a14 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Tue, 6 Jun 2017 12:56:28 +0200
Subject: [PATCH 1/3] 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.

Found with libFuzzer and ASan.
---
 valid.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/valid.c b/valid.c
index 8075d3a0..c51ea290 100644
--- a/valid.c
+++ b/valid.c
@@ -4627,6 +4627,12 @@ 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)
@@ -4638,6 +4644,7 @@ 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) {
-- 
2.14.1