linux-kernel - Re: [PATCH] PM / devfreq: fix double kfree

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Date:	Fri, 02 Oct 2015 02:11:27 +0000 (GMT)
From:	MyungJoo Ham <myungjoo.ham@...sung.com>
To:	Geliang Tang <geliangtang@....com>,
	박경민 <kyungmin.park@...sung.com>
Cc:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM / devfreq: fix double kfree

> When device_register() fails, kfree(devfreq) is called already in
> devfreq_dev_release(), hence there is no need to call kfree(devfreq)
> in err_dev again.
> 
> Signed-off-by: Geliang Tang <geliangtang@....com>

Thank you for pointing out that put_device() will eventually call kfree anyway.

Signed-off-by: MyungJoo Ham <myungjoo.ham@...sung.com>



Cheers,
MyungJoo

> ---
>  drivers/devfreq/devfreq.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index 3927ed9..9b352da 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -492,7 +492,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
>  	if (err) {
>  		put_device(&devfreq->dev);
>  		mutex_unlock(&devfreq->lock);
> -		goto err_dev;
> +		goto err_out;
>  	}
>  
>  	mutex_unlock(&devfreq->lock);
> @@ -518,7 +518,6 @@ struct devfreq *devfreq_add_device(struct device *dev,
>  err_init:
>  	list_del(&devfreq->node);
>  	device_unregister(&devfreq->dev);
> -err_dev:
>  	kfree(devfreq);
>  err_out:
>  	return ERR_PTR(err);
> -- 
> 2.5.0