linux-kernel - Re: [PATCH] led: triggers: Fix a memory leak bug

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Message-ID: <20190819211611.GA13437@amd>
Date:   Mon, 19 Aug 2019 23:16:11 +0200
From:   Pavel Machek <pavel@....cz>
To:     Wenwen Wang <wenwen@...uga.edu>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Dan Murphy <dmurphy@...com>,
        "open list:LED SUBSYSTEM" <linux-leds@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] led: triggers: Fix a memory leak bug

On Mon 2019-08-19 15:41:42, Wenwen Wang wrote:
> In led_trigger_set(), 'event' is allocated in kasprintf(). However, it is
> not deallocated in the following execution if the label 'err_activate' or
> 'err_add_groups' is entered, leading to memory leaks. To fix this issue,
> free 'event' before returning the error.
> 
> Signed-off-by: Wenwen Wang <wenwen@...uga.edu>

Acked-by: Pavel Machek <pavel@....cz>

> +++ b/drivers/leds/led-triggers.c
> @@ -173,6 +173,7 @@ int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
>  	list_del(&led_cdev->trig_list);
>  	write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, flags);
>  	led_set_brightness(led_cdev, LED_OFF);
> +	kfree(event);
>  
>  	return ret;
>  }

-- 
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