Validate parser parameter to XML_SetEntityDeclHandler

diff --git a/expat/lib/xmlparse.c b/expat/lib/xmlparse.c
index 29e68428d0256cfb5aed8e6e92a2f848515a0445..27accb2218e3285d4ee5c191e42ecabe87899cf4 100644 (file)
--- a/expat/lib/xmlparse.c
+++ b/expat/lib/xmlparse.c
@@ -1603,7 +1603,8 @@ void XMLCALL
 XML_SetEntityDeclHandler(XML_Parser parser,
                          XML_EntityDeclHandler handler)
 {
-  entityDeclHandler = handler;
+  if (parser != NULL)
+    entityDeclHandler = handler;
 }
 
 void XMLCALL