drm: check for minor master before allowing drop master.
authorDave Airlie <airlied@redhat.com>
Sun, 19 Apr 2009 23:32:50 +0000 (09:32 +1000)
committerDave Airlie <airlied@redhat.com>
Mon, 20 Apr 2009 00:04:28 +0000 (10:04 +1000)
When fast user switching a lot eventually we get to the point,
where we were checking for the wrong thing in this function.

Signed-off-by: Dave Airlie <airlied@redhat.com>
drivers/gpu/drm/drm_stub.c

index 1b3e0ff57b45392df76051d4a7cf260280a9aace..ef878615c49f65d33c47f2bb6397eb0e34d6cd3b 100644 (file)
@@ -185,6 +185,9 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
        if (!file_priv->is_master)
                return -EINVAL;
 
+       if (!file_priv->minor->master)
+               return -EINVAL;
+
        mutex_lock(&dev->struct_mutex);
        drm_master_put(&file_priv->minor->master);
        file_priv->is_master = 0;