linux-hardening - Re: [PATCH] crypto: sun8i-ce - Use kcalloc() instead of kzalloc()

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Message-ID: <ZbN2GfKU18pVEprw@gondor.apana.org.au>
Date: Fri, 26 Jan 2024 17:06:33 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Erick Archer <erick.archer@....com>
Cc: Corentin Labbe <clabbe.montjoie@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Jonathan Corbet <corbet@....net>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH] crypto: sun8i-ce - Use kcalloc() instead of kzalloc()

On Sun, Jan 21, 2024 at 04:34:07PM +0100, Erick Archer wrote:
> As noted in the "Deprecated Interfaces, Language Features, Attributes,
> and Conventions" documentation [1], size calculations (especially
> multiplication) should not be performed in memory allocator (or similar)
> function arguments due to the risk of them overflowing. This could lead
> to values wrapping around and a smaller allocation being made than the
> caller was expecting. Using those allocations could lead to linear
> overflows of heap memory and other misbehaviors.
> 
> So, use the purpose specific kcalloc() function instead of the argument
> size * count in the kzalloc() function.
> 
> Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
> Link: https://github.com/KSPP/linux/issues/162
> Signed-off-by: Erick Archer <erick.archer@....com>
> ---
>  drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt