linux-kernel - RE: [PATCH 01/12] PM / devfreq: Fix memory leak when fail to register device

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Date:   Mon, 28 Aug 2017 00:17:53 +0000
From:   MyungJoo Ham <myungjoo.ham@...sung.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>
CC:     "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
        "chanwoo@...nel.org" <chanwoo@...nel.org>,
        Inki Dae <inki.dae@...sung.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH 01/12] PM / devfreq: Fix memory leak when fail to
 register device

> When the devfreq_add_device fails to register deivce, the memory
> leak of devfreq instance happen. So, this patch fix the memory
> leak issue. Before freeing the devfreq instance checks whether
> devfreq instance is NULL or not because the device_unregister()
> frees the devfreq instance when jumping to the 'err_init'.
> It is to prevent the duplicate the kfee(devfreq).
> 
> Cc: stable@...r.kernel.org
> Fixes: ac4b281176a5 ("PM / devfreq: fix duplicated kfree on devfreq pointer")
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> ---
>  drivers/devfreq/devfreq.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)

This looks like to be duplicated. Please check your repo basis.


Cheers,
MyungJoo

> 
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index dea04871b50d..a1c4ee818614 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -564,7 +564,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
>  	err = device_register(&devfreq->dev);
>  	if (err) {
>  		mutex_unlock(&devfreq->lock);
> -		goto err_out;
> +		goto err_dev;
>  	}
>  
>  	devfreq->trans_table =	devm_kzalloc(&devfreq->dev,
> @@ -610,6 +610,9 @@ struct devfreq *devfreq_add_device(struct device *dev,
>  	mutex_unlock(&devfreq_list_lock);
>  
>  	device_unregister(&devfreq->dev);
> +err_dev:
> +	if (devfreq)
> +		kfree(devfreq);
>  err_out:
>  	return ERR_PTR(err);
>  }
> -- 
> 1.9.1