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Date:   Tue, 05 Feb 2019 16:36:40 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     tuba@....ufl.edu
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH]: net: hso: do not call unregister if not registered

From: "Yavuz, Tuba" <tuba@....ufl.edu>
Date: Tue, 5 Feb 2019 23:01:25 +0000

> 
> 
> On an error path inside the hso_create_net_device function of the hso
> driver, hso_free_net_device gets called. This causes potentially a
> negative reference count in the net device if register_netdev has not
> been called yet as hso_free_net_device calls unregister_netdev
> regardless. I think the driver should distinguish these cases and call
> unregister_netdev only if register_netdev has been called.
> 
> Signed-off-by: Tuba Yavuz <tuba@....ufl.edu>
> ---
> 
> --- linux-stable/drivers/net/usb/hso.c.orig     2019-01-27 14:45:58.232683119 -0500
> +++ linux-stable/drivers/net/usb/hso.c  2019-02-05 17:54:17.056496019 -0500
> @@ -2377,7 +2377,9 @@ static void hso_free_net_device(struct h
>  
>         remove_net_device(hso_net->parent);
>  
> -       if (hso_net->net)
> +       if (hso_net->net &&
> +           hso_net->net->reg_state == NETREG_REGISTERED
> +          )

This is not formatted correctly, the final closing ')' should end the
previous line, like this:

       if (hso_net->net &&
           hso_net->net->reg_state == NETREG_REGISTERED)

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