linux-hardening - Re: [PATCH] MIPS: Alchemy: Use kcalloc() instead of kzalloc()

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Date: Mon, 22 Jan 2024 10:43:28 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Erick Archer <erick.archer@....com>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH] MIPS: Alchemy: Use kcalloc() instead of kzalloc()



On 1/20/24 07:34, 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>

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

Thanks!
-- 
Gustavo

> ---
>   arch/mips/alchemy/common/clock.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/mips/alchemy/common/clock.c b/arch/mips/alchemy/common/clock.c
> index c01be8c45271..6c8996e20a7d 100644
> --- a/arch/mips/alchemy/common/clock.c
> +++ b/arch/mips/alchemy/common/clock.c
> @@ -771,7 +771,7 @@ static int __init alchemy_clk_init_fgens(int ctype)
>   	}
>   	id.flags = CLK_SET_RATE_PARENT | CLK_GET_RATE_NOCACHE;
> 
> -	a = kzalloc((sizeof(*a)) * 6, GFP_KERNEL);
> +	a = kcalloc(6, sizeof(*a), GFP_KERNEL);
>   	if (!a)
>   		return -ENOMEM;
> 
> --
> 2.25.1
> 
>