linux-kernel - Re: [PATCH v2] drivers/iio: Remove all strcpy() uses in favor of strscpy()

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Message-ID: <CAHp75VeAf_GYcF--=wXJmJZPr1YHn_gLFAFGHwsMCDX7Mxs5zw@mail.gmail.com>
Date:   Tue, 10 Aug 2021 15:11:01 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Len Baker <len.baker@....com>
Cc:     Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Kees Cook <keescook@...omium.org>,
        linux-hardening@...r.kernel.org,
        linux-iio <linux-iio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] drivers/iio: Remove all strcpy() uses in favor of strscpy()

On Tue, Aug 10, 2021 at 3:06 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Mon, Aug 9, 2021 at 7:14 PM Len Baker <len.baker@....com> wrote:



> Even if we leave the logic as is, this might be better
>
> if (orient[0] == '-')
>    str = devm_kstrdup(dev, orient + 1, GFP_KERNEL);

> else if (orient[0] != '0' || orient[1] != '\0')
>    str = devm_kasprintf(dev, GFP_KERNEL, "-%s", orient);
> else
>    str = devm_kstrdup(dev, orient, GFP_KERNEL);

Or these two swapped for better reading

 else if (orient[0] == '0' **&& orient[1] == '\0')
    str = devm_kstrdup(dev, orient, GFP_KERNEL);
else
    str = devm_kasprintf(dev, GFP_KERNEL, "-%s", orient);

And with a comment added that we negate the result according to the
rules: 1) drop leading '-' (minus); 2) leave 0 as is; add leading '-'
(minus).

> if (!str)
>    return -ENOMEM;



-- 
With Best Regards,
Andy Shevchenko