linux-hardening - Re: [PATCH] wifi: iwlegacy: Use kcalloc() instead of kzalloc()

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Message-ID: <170601069480.3962299.16944652749116926438.kvalo@kernel.org>
Date: Tue, 23 Jan 2024 11:51:36 +0000 (UTC)
From: Kalle Valo <kvalo@...nel.org>
To: Erick Archer <erick.archer@....com>
Cc: Stanislaw Gruszka <stf_xl@...pl>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Erick Archer <erick.archer@....com>, linux-wireless@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] wifi: iwlegacy: Use kcalloc() instead of kzalloc()

Erick Archer <erick.archer@....com> 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.
> 
> Also, it is preferred to use sizeof(*pointer) instead of sizeof(type)
> due to the type of the variable can change and one needs not change the
> former (unlike the latter).
> 
> 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>
> Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> Acked-by: Stanislaw Gruszka <stf_xl@...pl>

Patch applied to wireless-next.git, thanks.

acf868ff60b1 wifi: iwlegacy: Use kcalloc() instead of kzalloc()

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20240119171655.7740-1-erick.archer@gmx.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches