From e5430d8a07a7edf7e8700579a62644b5ed87c355 Mon Sep 17 00:00:00 2001
From: Rhodri James <rhodri@kynesim.co.uk>
Date: Tue, 25 Apr 2017 17:52:04 +0100
Subject: [PATCH] Validate parser parameter to XML_SetXmlDeclHandler

---
 expat/lib/xmlparse.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/expat/lib/xmlparse.c b/expat/lib/xmlparse.c
index 27accb22..3125c671 100644
--- a/expat/lib/xmlparse.c
+++ b/expat/lib/xmlparse.c
@@ -1610,7 +1610,8 @@ XML_SetEntityDeclHandler(XML_Parser parser,
 void XMLCALL
 XML_SetXmlDeclHandler(XML_Parser parser,
                       XML_XmlDeclHandler handler) {
-  xmlDeclHandler = handler;
+  if (parser != NULL)
+    xmlDeclHandler = handler;
 }
 
 int XMLCALL