From 2315924f2a875b56d40af7b3fc8f6abdb60ef3dc Mon Sep 17 00:00:00 2001
From: Rhodri James <rhodri@kynesim.co.uk>
Date: Tue, 25 Apr 2017 17:27:00 +0100
Subject: [PATCH] Validate parser parameter to XML_SetDoctypeDeclHandler

---
 expat/lib/xmlparse.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/expat/lib/xmlparse.c b/expat/lib/xmlparse.c
index 2de26ba2..40590e7f 100644
--- a/expat/lib/xmlparse.c
+++ b/expat/lib/xmlparse.c
@@ -1476,6 +1476,8 @@ XML_SetDoctypeDeclHandler(XML_Parser parser,
                           XML_StartDoctypeDeclHandler start,
                           XML_EndDoctypeDeclHandler end)
 {
+  if (parser == NULL)
+    return;
   startDoctypeDeclHandler = start;
   endDoctypeDeclHandler = end;
 }