Validate parser parameter to XML_SetXmlDeclHandler

diff --git a/expat/lib/xmlparse.c b/expat/lib/xmlparse.c
index 27accb2218e3285d4ee5c191e42ecabe87899cf4..3125c671db8560b77db773f751db65c914d6a275 100644 (file)
--- 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