linux-kernel - Re: [PATCH] scsi: Use vmemdup_user to replace the open code

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Date:   Mon, 13 Aug 2018 20:50:51 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     <don.brace@...rosemi.com>, <jejb@...ux.vnet.ibm.com>,
        <martin.petersen@...cle.com>
CC:     <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: Use vmemdup_user to replace the open code

Please ignore the patch, will repost . Thanks
On 2018/8/13 20:22, zhong jiang wrote:
> vmemdup_user is better than duplicating its implementation, So just
> replace the open code.
>
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
> ---
>  drivers/scsi/hpsa.c | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
> index 58bb70b..948576a 100644
> --- a/drivers/scsi/hpsa.c
> +++ b/drivers/scsi/hpsa.c
> @@ -6381,13 +6381,9 @@ static int hpsa_big_passthru_ioctl(struct ctlr_info *h, void __user *argp)
>  		return -EINVAL;
>  	if (!capable(CAP_SYS_RAWIO))
>  		return -EPERM;
> -	ioc = kmalloc(sizeof(*ioc), GFP_KERNEL);
> -	if (!ioc) {
> -		status = -ENOMEM;
> -		goto cleanup1;
> -	}
> -	if (copy_from_user(ioc, argp, sizeof(*ioc))) {
> -		status = -EFAULT;
> +	ioc = vmemdup_user(argp, sizeof(*ioc));
> +	if (IS_ERR(ioc)) {
> +		status = PTR_ERR(ioc);
>  		goto cleanup1;
>  	}
>  	if ((ioc->buf_size < 1) &&