linux-kernel - [Patch v2] leds: ledtrig-tty: free allocated ttyname buffer on deactivate

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Message-ID: <20231106141205.3376954-1-fe@dev.tdt.de>
Date:   Mon,  6 Nov 2023 15:12:05 +0100
From:   Florian Eckert <fe@....tdt.de>
To:     Eckert.Florian@...glemail.com, pavel@....cz, lee@...nel.org,
        kabel@...nel.org, gregkh@...uxfoundation.org,
        u.kleine-koenig@...gutronix.de
Cc:     linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: [Patch v2] leds: ledtrig-tty: free allocated ttyname buffer on deactivate

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@...r.kernel.org
Fixes: fd4a641ac88f ("leds: trigger: implement a tty trigger")
Signed-off-by: Florian Eckert <fe@....tdt.de>
---
v1 -> v2:
Add Cc: tag

 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;
+
 	kfree(trigger_data);
 }
 
-- 
2.30.2