From c51f3cf1993611e43ca799bf0cfdd2fd9ab1a17a Mon Sep 17 00:00:00 2001
From: Peter Clifton <pcjc2@cam.ac.uk>
Date: Sun, 15 Nov 2009 19:42:27 +0000
Subject: [PATCH] hid/gtk: Add a guard against GC's being passed from another
 HID

Various other HIDs have this check.
---
 src/hid/gtk/gtkhid-gdk.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/hid/gtk/gtkhid-gdk.c b/src/hid/gtk/gtkhid-gdk.c
index 51a6f224..dc2ad984 100644
--- a/src/hid/gtk/gtkhid-gdk.c
+++ b/src/hid/gtk/gtkhid-gdk.c
@@ -441,6 +441,13 @@ ghid_set_line_cap_angle (hidGC gc, int x1, int y1, int x2, int y2)
 static int
 use_gc (hidGC gc)
 {
+
+  if (gc->me_pointer != &ghid_hid)
+    {
+      fprintf (stderr, "Fatal: GC from another HID passed to GTK HID\n");
+      abort ();
+    }
+
   if (!gport->pixmap)
     return 0;
   if (!gc->gc)
-- 
2.11.4.GIT