linux-kernel - Re: [PATCH net] net: hso: bail out on interrupt URB allocation failure

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Date:   Wed, 19 May 2021 16:23:04 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: hso: bail out on interrupt URB allocation
 failure

On Wed, May 19, 2021 at 02:47:17PM +0200, Johan Hovold wrote:
> Commit 31db0dbd7244 ("net: hso: check for allocation failure in
> hso_create_bulk_serial_device()") recently started returning an error
> when the driver fails to allocate resources for the interrupt endpoint
> and tiocmget functionality.
> 
> For consistency let's bail out from probe also if the URB allocation
> fails.
> 
> Signed-off-by: Johan Hovold <johan@...nel.org>
> ---
>  drivers/net/usb/hso.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
> index 260f850d69eb..b48b2a25210c 100644
> --- a/drivers/net/usb/hso.c
> +++ b/drivers/net/usb/hso.c
> @@ -2635,14 +2635,14 @@ static struct hso_device *hso_create_bulk_serial_device(
>  		}
>  
>  		tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
> -		if (tiocmget->urb) {
> -			mutex_init(&tiocmget->mutex);
> -			init_waitqueue_head(&tiocmget->waitq);
> -		} else
> -			hso_free_tiomget(serial);

Thanks!  The original code works, but it's so suspicious looking because
you would think hso_free_tiomget() lead to a use after free later.

Reviewed-by: Dan Carpenter <dan.carpenter@...cle.com>

regards,
dan carpenter