Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 as permitted sender) client-ip=2620:137:e000::3:3;
Date:   Sat, 30 Sep 2023 09:34:34 -0700
From:   Dmitry Torokhov <dmitry.torokhov@gmail.com>
To:     Justin Stitt <justinstitt@google.com>
Cc:     Chen-Yu Tsai <wens@csie.org>, linux-input@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org,
        Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH v2] Input: axp20x-pek - avoid needless newline removal
Message-ID: <ZRhOGiZjEI8EEgtl@google.com>
References: <20230925-strncpy-drivers-input-misc-axp20x-pek-c-v2-1-ff7abe8498d6@google.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20230925-strncpy-drivers-input-misc-axp20x-pek-c-v2-1-ff7abe8498d6@google.com>
Precedence: bulk

On Mon, Sep 25, 2023 at 04:31:05AM +0000, Justin Stitt wrote:
> This code is doing more work than it needs to.
> 
> Before handing off `val_str` to `kstrtouint()` we are eagerly removing
> any trailing newline which requires copying `buf`, validating it's
> length and checking/replacing any potential newlines.
> 
> kstrtouint() handles this implicitly:
> kstrtouint ->
>   kstrotoull -> (documentation)
> |   /**
> |    * kstrtoull - convert a string to an unsigned long long
> |    * @s: The start of the string. The string must be null-terminated, and may also
> |    *  include a single newline before its terminating null. The first character
> |    ...
> 
> Let's remove the redundant functionality and let kstrtouint handle it.
> 
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@vger.kernel.org
> Suggested-by: Kees Cook <keescook@chromium.org>
> Signed-off-by: Justin Stitt <justinstitt@google.com>

Applied, thank you.

-- 
Dmitry