linux-hardening - Re: [PATCH] mtd: maps: sa1100-flash: Prefer struct

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Message-Id: <20240409064051.91775-1-miquel.raynal@bootlin.com>
Date: Tue,  9 Apr 2024 08:40:51 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Erick Archer <erick.archer@...look.com>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>,
	Tudor Ambarus <tudor.ambarus@...aro.org>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Kees Cook <keescook@...omium.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH] mtd: maps: sa1100-flash: Prefer struct_size over open coded arithmetic

On Sat, 2024-03-30 at 17:55:35 UTC, Erick Archer wrote:
> This is an effort to get rid of all multiplications from allocation
> functions in order to prevent integer overflows [1][2].
> 
> As the "info" variable is a pointer to "struct sa_info" and this
> structure ends in a flexible array:
> 
> struct sa_info {
> 	[...]
> 	struct sa_subdev_info	subdev[];
> };
> 
> the preferred way in the kernel is to use the struct_size() helper to
> do the arithmetic instead of the calculation "size + size * count" in
> the kzalloc() function.
> 
> This way, the code is more readable and safer.
> 
> This code was detected with the help of Coccinelle, and audited and
> modified manually.
> 
> 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]
> Signed-off-by: Erick Archer <erick.archer@...look.com>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/next, thanks.

Miquel