[patch] staging: frontier: use after free in disconnect()

[Dan Carpenter]

usb_alphatrack_delete() frees "dev" so we can't use it on that path.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/staging/frontier/alphatrack.c 
b/drivers/staging/frontier/alphatrack.c
index 5590ebf..817f837 100644
--- a/drivers/staging/frontier/alphatrack.c
+++ b/drivers/staging/frontier/alphatrack.c
@@ -827,11 +827,11 @@ static void usb_alphatrack_disconnect(struct 
usb_interface *intf)
                mutex_unlock(&dev->mtx);
                usb_alphatrack_delete(dev);
        } else {
+               atomic_set(&dev->writes_pending, 0);
                dev->intf = NULL;
                mutex_unlock(&dev->mtx);
        }
 
-       atomic_set(&dev->writes_pending, 0);
        mutex_unlock(&disconnect_mutex);
 
        dev_info(&intf->dev, "Alphatrack Surface #%d now disconnected\n",
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