staging: most: usb: check for NULL device

Check if the dci structer has been allocated before trying to release it.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Link: https://lore.kernel.org/r/1579793906-5054-8-git-send-email-christian.gromm@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/most/usb/usb.c b/drivers/staging/most/usb/usb.c
index dcc78cd870b8c12efb074ce3a35967bd89f776b5..0bda88c4bc895eb894ebb7791be1c1d3683d4af2 100644 (file)
--- a/drivers/staging/most/usb/usb.c
+++ b/drivers/staging/most/usb/usb.c
@@ -1218,7 +1218,8 @@ static void hdm_disconnect(struct usb_interface *interface)
        del_timer_sync(&mdev->link_stat_timer);
        cancel_work_sync(&mdev->poll_work_obj);
 
-       device_unregister(&mdev->dci->dev);
+       if (mdev->dci)
+               device_unregister(&mdev->dci->dev);
        most_deregister_interface(&mdev->iface);
 
        kfree(mdev->busy_urbs);