From 31844c74df39c3b88735ef884c33c41da9d52795 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <[email protected]>
Date: Sun, 5 Mar 2023 14:10:08 +0100
Subject: [PATCH] malloc-fail: Fix null deref in xmlSchemaParseUnion

Found with libFuzzer, see #344.

Reference:https://github.com/GNOME/libxml2/commit/31844c74df39c3b88735ef884c33c41da9d52795
Conflict:NA
---
 xmlschemas.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xmlschemas.c b/xmlschemas.c
index 06bf664..5b93937 100644
--- a/xmlschemas.c
+++ b/xmlschemas.c
@@ -9006,6 +9006,8 @@ xmlSchemaParseUnion(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
 	xmlSchemaQNameRefPtr ref;
 
 	cur = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
+        if (cur == NULL)
+            return (-1);
 	type->base = cur;
 	do {
 	    while (IS_BLANK_CH(*cur))
-- 
2.27.0