From e15838ab5454514e53981585c71cd20bb1537d01 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Sun, 5 Mar 2023 14:09:14 +0100
Subject: [PATCH] malloc-fail: Fix null deref in xmlSchemaParseWildcardNs

Found with libFuzzer, see #344.

Reference:https://github.com/GNOME/libxml2/commit/e15838ab5454514e53981585c71cd20bb1537d01
Conflict:NA
---
 xmlschemas.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xmlschemas.c b/xmlschemas.c
index 9ace2b7..dd79d2e 100644
--- a/xmlschemas.c
+++ b/xmlschemas.c
@@ -6867,6 +6867,8 @@ xmlSchemaParseWildcardNs(xmlSchemaParserCtxtPtr ctxt,
      */
     attr = xmlSchemaGetPropNode(node, "namespace");
     ns = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
+    if (ns == NULL)
+        return (-1);
     if ((attr == NULL) || (xmlStrEqual(ns, BAD_CAST "##any")))
 	wildc->any = 1;
     else if (xmlStrEqual(ns, BAD_CAST "##other")) {
-- 
2.27.0