Received-SPF: pass (google.com: domain of linux-kernel+bounces-66870-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) client-ip=2604:1380:4601:e00::3;
Date: Thu, 15 Feb 2024 14:16:59 +0200
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Robin van der Gracht <robin@protonic.nl>,
	Paul Burton <paulburton@kernel.org>
Subject: Re: [PATCH v2 10/15] auxdisplay: linedisp: Provide a small buffer in
 the struct linedisp
Message-ID: <Zc4Au5Q_rOAx7_4Y@smile.fi.intel.com>
References: <20240212170423.2860895-1-andriy.shevchenko@linux.intel.com>
 <20240212170423.2860895-11-andriy.shevchenko@linux.intel.com>
 <CAMuHMdVtqWBi4Y1tj74m4V4kp-3cFe_FphKKeY7zOkrbMVkKRg@mail.gmail.com>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <CAMuHMdVtqWBi4Y1tj74m4V4kp-3cFe_FphKKeY7zOkrbMVkKRg@mail.gmail.com>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo

On Thu, Feb 15, 2024 at 11:40:44AM +0100, Geert Uytterhoeven wrote:
> On Mon, Feb 12, 2024 at 6:04 PM Andy Shevchenko
> <andriy.shevchenko@linux.intel.com> wrote:

..

> > +       linedisp->buf = buf ? buf : linedisp->curr;
> > +       linedisp->num_chars = buf ? num_chars : min(num_chars, LINEDISP_DEFAULT_BUF_SZ);
> 
> I think it would be safer to return an error if buf == NULL and
> num_chars < LINEDISP_DEFAULT_BUF_SZ.

I think you meant >= ?

> Else a careless driver that doesn't check linedisp->num_chars might
> overflow the buffer.

Okay, check has been added.

-- 
With Best Regards,
Andy Shevchenko