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

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Date:   Wed, 11 May 2022 15:25:52 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
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()

Hi,

On 2022/5/11 14:45, Greg KH wrote:
> 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?
It's no functional change and I got this by 
scripts/coccinelle/api/kfree_sensitive.cocci.
I'm not sure why using memset() here.

Thanks,
Yang
>
> thanks,
>
> greg k-h
> .