linux-kernel - Re: [PATCH -next] staging: greybus: camera: Switch to memdup_user

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Date:   Thu, 1 Apr 2021 10:41:07 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-staging@...ts.linux.dev>,
        <johan@...nel.org>, <elder@...nel.org>,
        <gregkh@...uxfoundation.org>
Subject: Re: [PATCH -next] staging: greybus: camera: Switch to
 memdup_user_nul()

Hi,

On 2021/3/31 18:24, Dan Carpenter wrote:
> On Wed, Mar 31, 2021 at 05:52:01PM +0800, Yang Yingliang wrote:
>> Use memdup_user_nul() helper instead of open-coding to
>> simplify the code.
>>
>> Reported-by: Hulk Robot <hulkci@...wei.com>
>> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
>> ---
>>   drivers/staging/greybus/camera.c | 10 ++--------
>>   1 file changed, 2 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/staging/greybus/camera.c b/drivers/staging/greybus/camera.c
>> index b570e13394ac..0f005facffbc 100644
>> --- a/drivers/staging/greybus/camera.c
>> +++ b/drivers/staging/greybus/camera.c
>> @@ -1120,16 +1120,10 @@ static ssize_t gb_camera_debugfs_write(struct file *file,
>>   	if (len > 1024)
>>   		return -EINVAL;
>>   
>> -	kbuf = kmalloc(len + 1, GFP_KERNEL);
>> -	if (!kbuf)
>> +	kbuf = memdup_user_nul(buf, len);
>> +	if (IS_ERR(kbuf))
>>   		return -ENOMEM;
> return PTR_ERR(kbuf);
>
>>   
>> -	if (copy_from_user(kbuf, buf, len)) {
>> -		ret = -EFAULT;
>> -		goto done;
>> -	}
>> -
>> -	kbuf[len] = '\0';
>>   
>     ^^^^^^^^
> Please delete this blank line so there aren't two blank lines in a row.

I will change it and send a v2.

Thanks,

Yang

>
>>   	ret = op->execute(gcam, kbuf, len);
> regards,
> dan carpenter
>
> .