linux-kernel - RE: [PATCH v2] scsi: Use vmemdup

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Date:   Mon, 13 Aug 2018 14:20:20 +0000
From:   <Don.Brace@...rochip.com>
To:     <zhongjiang@...wei.com>, <don.brace@...rosemi.com>,
        <jejb@...ux.vnet.ibm.com>, <martin.petersen@...cle.com>
CC:     <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] scsi: Use vmemdup_user to replace the open code

> -----Original Message-----
> From: zhong jiang [mailto:zhongjiang@...wei.com]
> Sent: Monday, August 13, 2018 7:43 AM
> To: don.brace@...rosemi.com; jejb@...ux.vnet.ibm.com;
> martin.petersen@...cle.com
> Cc: linux-kernel@...r.kernel.org
> Subject: [PATCH v2] scsi: Use vmemdup_user to replace the open code
> 
> EXTERNAL EMAIL
> 
> 
> EXTERNAL EMAIL
> 
> 
> vmemdup_user is better than duplicating its implementation, So just
> replace the open code.
> 
> The issue is detected with the help of Coccinelle.
> 
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
Tested-by: Don Brace <don.brace@...rosemi.com>
Acked-by: Don Brace <don.brace@...rosemi.com>

> ---
>  drivers/scsi/hpsa.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
> index 58bb70b..666ba09e5 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) &&
> @@ -6505,7 +6501,7 @@ static int hpsa_big_passthru_ioctl(struct ctlr_info *h,
> void __user *argp)
>                 kfree(buff);
>         }
>         kfree(buff_size);
> -       kfree(ioc);
> +       kvfree(ioc);
>         return status;
>  }
> 
> --
> 1.7.12.4