Re: [PATCH] gpiolib: Free the last requested descriptor

[Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>]

Reported-by: Jan Lorenzen <jl@xxxxxxxxx>
On Thu, Sep 13, 2018 at 3:37 PM Ricardo Ribalda Delgado
<ricardo.ribalda@xxxxxxxxx> wrote:
>
> The current code only frees N-1 gpios if an error occurs during
> gpiod_set_transitory, gpiod_direction_output or gpiod_direction_input.
> Leading to gpios that cannot be used by userspace nor other drivers.
>
> Cc: Timur Tabi <timur@xxxxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: ab3dbcf78f60f46d ("gpioib: do not free unrequested descriptors)
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>
> ---
>  drivers/gpio/gpiolib.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index e8f8a1999393..a57300c1d649 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -571,7 +571,7 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
>                 if (ret)
>                         goto out_free_descs;
>                 lh->descs[i] = desc;
> -               count = i;
> +               count = i + 1;
>
>                 if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW)
>                         set_bit(FLAG_ACTIVE_LOW, &desc->flags);
> --
> 2.18.0
>


-- 
Ricardo Ribalda