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leds: ledtrig-tty: Free allocated ttyname buffer on deactivate 

commit 25054b232681c286fca9c678854f56494d1352cc upstream.

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.

Cc: stable@vger.kernel.org
Fixes: fd4a641ac8 ("leds: trigger: implement a tty trigger")
Signed-off-by: Florian Eckert <fe@dev.tdt.de>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20231127081621.774866-1-fe@dev.tdt.de
Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Florian Eckert 2023-11-27 09:16:21 +01:00 committed by Greg Kroah-Hartman
parent 12786872b2
commit 7db7504a3e
1 changed files with 4 additions and 0 deletions
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4
drivers/leds/trigger/ledtrig-tty.c
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@ -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;
kfree(trigger_data);
}