On Thu, Nov 09, 2023 at 09:50:34AM +0100, Florian Eckert wrote:
> The ttyname buffer for the ledtrig_tty_data struct is allocated in the
> sysfs ttyname_store() function. This buffer must be released on trigger
> deactivation. This was missing and is thus a memory leak.
>
> While we are at it, the tty handler in the ledtrig_tty_data struct should
> also be returned in case of the trigger deactivation call.
>
> Fixes: fd4a641ac88f ("leds: trigger: implement a tty trigger")
> Reviewed-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
> Signed-off-by: Florian Eckert <fe@xxxxxxxxxx>
> ---
> drivers/leds/trigger/ledtrig-tty.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/leds/trigger/ledtrig-tty.c b/drivers/leds/trigger/ledtrig-tty.c
> index 8ae0d2d284af..3e69a7bde928 100644
> --- a/drivers/leds/trigger/ledtrig-tty.c
> +++ b/drivers/leds/trigger/ledtrig-tty.c
> @@ -168,6 +168,10 @@ static void ledtrig_tty_deactivate(struct led_classdev *led_cdev)
>
> cancel_delayed_work_sync(&trigger_data->dwork);
>
> + kfree(trigger_data->ttyname);
> + tty_kref_put(trigger_data->tty);
> + trigger_data->tty = NULL;
> +
This should be a stand-alone patch with a proper cc: stable tag added as
well so that it can be accepted now, as it is independent of this new
feature you are adding.
thanks,
greg k-h
