From 4980bcef9973ba1f90f53028f061669ee5d2661b Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Tue, 23 Apr 2013 15:46:04 +1000
Subject: [PATCH] dix: freeing a null grab is a bug, complain if doing so

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
---
 dix/grabs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dix/grabs.c b/dix/grabs.c
index 3b02352df..0a2111d8a 100644
--- a/dix/grabs.c
+++ b/dix/grabs.c
@@ -249,6 +249,8 @@ CreateGrab(int client, DeviceIntPtr device, DeviceIntPtr modDevice,
 void
 FreeGrab(GrabPtr pGrab)
 {
+    BUG_RETURN(!pGrab);
+
     if (pGrab->grabtype == XI2 && pGrab->type == XI_TouchBegin)
         TouchListenerGone(pGrab->resource);