linux-hardening - Re: [PATCH v2] mtd: rawnand: Prefer struct

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Date: Sun, 11 Feb 2024 12:51:21 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Erick Archer <erick.archer@....com>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>, 
	Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, 
	Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, Martin Blumenstingl <martin.blumenstingl@...glemail.com>, 
	Heiko Stuebner <heiko@...ech.de>, Philippe Mathieu-Daudé <philmd@...aro.org>, 
	Rob Herring <robh@...nel.org>, Li Zetao <lizetao1@...wei.com>, 
	"Gustavo A. R. Silva" <gustavoars@...nel.org>, Kees Cook <keescook@...omium.org>, linux-mtd@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mediatek@...ts.infradead.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] mtd: rawnand: Prefer struct_size over open coded
 arithmetic

On Sun, Feb 11, 2024 at 10:16:33AM +0100, Erick Archer wrote:
> This is an effort to get rid of all multiplications from allocation
> functions in order to prevent integer overflows [1].
> 
> As the "chip" variable is a pointer to "struct mtk_nfc_nand_chip" and
> this structure ends in a flexible array:
> 
> struct mtk_nfc_nand_chip {
> 	[...]
> 	u8 sels[] __counted_by(nsels);
> };
> 
> the preferred way in the kernel is to use the struct_size() helper to
> do the arithmetic instead of the argument "size + count * size" in the
> devm_kzalloc() function.
> 
> This way, the code is more readable and safer.
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
> Link: https://github.com/KSPP/linux/issues/160 [2]
> Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> Signed-off-by: Erick Archer <erick.archer@....com>

Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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