From 0c5f65ecd3ad11fbdb1cab3cb1d0eb4f33bb4e35 Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter@cs.unisa.edu.au>
Date: Sun, 14 Oct 2007 07:57:24 +0930
Subject: [PATCH] dix: don't allow slave devices as ClientPointer

---
 dix/events.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/dix/events.c b/dix/events.c
index 8141a4051..b84d18dee 100644
--- a/dix/events.c
+++ b/dix/events.c
@@ -6103,6 +6103,16 @@ WriteEventsToClient(ClientPtr pClient, int count, xEvent *events)
 _X_EXPORT Bool
 SetClientPointer(ClientPtr client, ClientPtr setter, DeviceIntPtr device)
 {
+    if (!device->isMaster)
+    {
+        ErrorF("[dix] Need master device for ClientPointer. This is a bug.\n");
+        return FALSE;
+    } else if (!device->spriteInfo->spriteOwner)
+    {
+        ErrorF("[dix] Device %d does not have a sprite. " 
+                "Cannot be ClientPointer\n", device->id);
+        return FALSE;
+    }
     client->clientPtr = device;
     return TRUE;
 }