linux-kernel - Re: [PATCH v2] usb: isp1760: Use kasprintf

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Date:   Wed, 7 Mar 2018 11:16:15 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Himanshu Jha <himanshujha199640@...il.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Johan Hovold <johan@...nel.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] usb: isp1760: Use kasprintf

On Wed, Mar 7, 2018 at 10:38 AM, Himanshu Jha
<himanshujha199640@...il.com> wrote:
> Use kasprintf instead of combination of kmalloc and sprintf and
> therefore avoid unnecessary computation of string length.
> Also, remove the useless local variable.
>
> Signed-off-by: Himanshu Jha <himanshujha199640@...il.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  drivers/usb/isp1760/isp1760-udc.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
>
> v2:
>    -removed the useless local variable devname.
>
> diff --git a/drivers/usb/isp1760/isp1760-udc.c b/drivers/usb/isp1760/isp1760-udc.c
> index bac4ef5..1714b22 100644
> --- a/drivers/usb/isp1760/isp1760-udc.c
> +++ b/drivers/usb/isp1760/isp1760-udc.c
> @@ -1441,7 +1441,6 @@ int isp1760_udc_register(struct isp1760_device *isp, int irq,
>                          unsigned long irqflags)
>  {
>         struct isp1760_udc *udc = &isp->udc;
> -       const char *devname;
>         int ret;
>
>         udc->irq = -1;
> @@ -1455,13 +1454,10 @@ int isp1760_udc_register(struct isp1760_device *isp, int irq,
>         if (ret < 0)
>                 return ret;
>
> -       devname = dev_name(isp->dev);
> -       udc->irqname = kmalloc(strlen(devname) + 7, GFP_KERNEL);
> +       udc->irqname = kasprintf(GFP_KERNEL, "%s (udc)", dev_name(isp->dev));
>         if (!udc->irqname)
>                 return -ENOMEM;
>
> -       sprintf(udc->irqname, "%s (udc)", devname);
> -
>         ret = request_irq(irq, isp1760_udc_irq, IRQF_SHARED | irqflags,
>                           udc->irqname, udc);
>         if (ret < 0)
> --
> 2.7.4
>



-- 
Kees Cook
Pixel Security