linux-kernel - Re: [PATCH] mmc/core/block: Use memdup_user() rather than duplicating its implementation

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Date:   Thu, 15 Mar 2018 11:23:30 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] mmc/core/block: Use memdup_user() rather than duplicating
 its implementation

On 5 March 2018 at 13:08, SF Markus Elfring
<elfring@...rs.sourceforge.net> wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Mon, 5 Mar 2018 11:33:21 +0100
>
> Reuse existing functionality from memdup_user() instead of keeping
> duplicate source code.
>
> This issue was detected by using the Coccinelle software.
>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>

Thanks, applied for next!

Kind regards
Uffe

> ---
>  drivers/mmc/core/block.c | 15 ++++-----------
>  1 file changed, 4 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index 20135a5de748..4b09c7380e70 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -375,22 +375,15 @@ static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
>                 return idata;
>         }
>
> -       idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
> -       if (!idata->buf) {
> -               err = -ENOMEM;
> +       idata->buf = memdup_user((void __user *)(unsigned long)
> +                                idata->ic.data_ptr, idata->buf_bytes);
> +       if (IS_ERR(idata->buf)) {
> +               err = PTR_ERR(idata->buf);
>                 goto idata_err;
>         }
>
> -       if (copy_from_user(idata->buf, (void __user *)(unsigned long)
> -                                       idata->ic.data_ptr, idata->buf_bytes)) {
> -               err = -EFAULT;
> -               goto copy_err;
> -       }
> -
>         return idata;
>
> -copy_err:
> -       kfree(idata->buf);
>  idata_err:
>         kfree(idata);
>  out:
> --
> 2.16.2
>
> --
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