Validate parser parameter to XML_SetCommentHandler

diff --git a/expat/lib/xmlparse.c b/expat/lib/xmlparse.c
index f96f4e3c6b8d523c57aea48f188967d76be37a26..cb6f345f7ffceb90c3ea2d3c24e443609e116e11 100644 (file)
--- a/expat/lib/xmlparse.c
+++ b/expat/lib/xmlparse.c
@@ -1422,7 +1422,8 @@ void XMLCALL
 XML_SetCommentHandler(XML_Parser parser,
                       XML_CommentHandler handler)
 {
-  commentHandler = handler;
+  if (parser != NULL)
+    commentHandler = handler;
 }
 
 void XMLCALL