linux-kernel - Re: [PATCH -next] drivers: w1: use kfree

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Date:   Wed, 11 May 2022 08:45:09 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        zbr@...emap.net, jdelvare@...e.com, linux@...ck-us.net
Subject: Re: [PATCH -next] drivers: w1: use kfree_sensitive()

On Wed, May 11, 2022 at 02:49:54PM +0800, Yang Yingliang wrote:
> Use kfree_sensitive() instead of open-coding it.
> 
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>  drivers/w1/w1.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
> index f2ae2e563dc5..a0a6c3c739d9 100644
> --- a/drivers/w1/w1.c
> +++ b/drivers/w1/w1.c
> @@ -73,8 +73,7 @@ static void w1_master_release(struct device *dev)
>  	struct w1_master *md = dev_to_w1_master(dev);
>  
>  	dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name);
> -	memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
> -	kfree(md);
> +	kfree_sensitive(md);

Does this actually change anything?  Why is the memset being called here
at all?

thanks,

greg k-h