Validate parser parameter to XML_SetNotationDeclHandler

diff --git a/expat/lib/xmlparse.c b/expat/lib/xmlparse.c
index a89cf0e1311c977c9aa09913bc30e339c505f084..434ba66207506dd36de021385ec4446a2d5e7ef3 100644 (file)
--- a/expat/lib/xmlparse.c
+++ b/expat/lib/xmlparse.c
@@ -1508,7 +1508,8 @@ void XMLCALL
 XML_SetNotationDeclHandler(XML_Parser parser,
                            XML_NotationDeclHandler handler)
 {
-  notationDeclHandler = handler;
+  if (parser != NULL)
+    notationDeclHandler = handler;
 }
 
 void XMLCALL