Validate parser parameter to XML_SetStartDoctypeDeclHandler

diff --git a/expat/lib/xmlparse.c b/expat/lib/xmlparse.c
index 40590e7f7a6a37d4270852b2e40ce65b611028c9..dad0b468f3684170400397bca73c2c9c3a9473be 100644 (file)
--- a/expat/lib/xmlparse.c
+++ b/expat/lib/xmlparse.c
@@ -1485,7 +1485,8 @@ XML_SetDoctypeDeclHandler(XML_Parser parser,
 void XMLCALL
 XML_SetStartDoctypeDeclHandler(XML_Parser parser,
                                XML_StartDoctypeDeclHandler start) {
-  startDoctypeDeclHandler = start;
+  if (parser != NULL)
+    startDoctypeDeclHandler = start;
 }
 
 void XMLCALL