linux-hardening - Re: [PATCH] clk: hisilicon: Use devm_kcalloc() instead of devm

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Message-ID: <b21d9eb5-eeb7-460f-99c1-9878532be148@embeddedor.com>
Date: Mon, 22 Jan 2024 11:51:49 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Erick Archer <erick.archer@....com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Conor Dooley <conor.dooley@...rochip.com>,
 Heiko Stuebner <heiko@...ech.de>, Dinh Nguyen <dinguyen@...nel.org>,
 Rob Herring <robh@...nel.org>, Nick Alcock <nick.alcock@...cle.com>,
 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH] clk: hisilicon: Use devm_kcalloc() instead of
 devm_kzalloc()

On 1/21/24 08:29, 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 devm_kcalloc() function instead of the
> argument size * count in the devm_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>

Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks!
-- 
Gustavo

> ---
>   drivers/clk/hisilicon/clk-hi3559a.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/hisilicon/clk-hi3559a.c b/drivers/clk/hisilicon/clk-hi3559a.c
> index ff4ca0edce06..da476f940326 100644
> --- a/drivers/clk/hisilicon/clk-hi3559a.c
> +++ b/drivers/clk/hisilicon/clk-hi3559a.c
> @@ -461,8 +461,7 @@ static void hisi_clk_register_pll(struct hi3559av100_pll_clock *clks,
>   	struct clk_init_data init;
>   	int i;
> 
> -	p_clk = devm_kzalloc(dev, sizeof(*p_clk) * nums, GFP_KERNEL);
> -
> +	p_clk = devm_kcalloc(dev, nums, sizeof(*p_clk), GFP_KERNEL);
>   	if (!p_clk)
>   		return;
> 
> --
> 2.25.1
> 
>