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

[Gustavo A. R. Silva]

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@xxxxxxx>

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

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