From da13b83737e85e2d8ed9c737ed641037a8c8ae5e Mon Sep 17 00:00:00 2001
From: inmarket <andrewh@inmarket.com.au>
Date: Sat, 3 Jan 2015 18:42:51 +1000
Subject: Safety protection in creation of extended GWIN types.

---
 src/gwin/gwin_gwin.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/gwin')

diff --git a/src/gwin/gwin_gwin.c b/src/gwin/gwin_gwin.c
index 03902c9b..eb51b89a 100644
--- a/src/gwin/gwin_gwin.c
+++ b/src/gwin/gwin_gwin.c
@@ -16,6 +16,8 @@
 
 #include "gwin_class.h"
 
+#include <string.h>
+
 /*-----------------------------------------------
  * Data
  *-----------------------------------------------*/
@@ -97,6 +99,10 @@ GHandle _gwindowCreate(GDisplay *g, GWindowObject *pgw, const GWindowInit *pInit
 		pgw->font = defaultFont;
 	#endif
 
+	// Make sure we don't create nasty problems for ourselves
+	if (vmt->size > sizeof(GWindowObject))
+		memset(pgw+1, 0, vmt->size - sizeof(GWindowObject));
+
 	if (!_gwinWMAdd(pgw, pInit)) {
 		if ((pgw->flags & GWIN_FLG_DYNAMIC))
 			gfxFree(pgw);
-- 
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