Re: [PATCH][net-next] net/mlx4: Use array_size() helper in copy_to_user()

[Tariq Toukan]

On 9/28/2021 11:17 PM, Gustavo A. R. Silva wrote:
> Use array_size() helper instead of the open-coded version in
> copy_to_user(). These sorts of multiplication factors need
> to be wrapped in array_size().
>
> Link: https://github.com/KSPP/linux/issues/160
> Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
> ---
>   drivers/net/ethernet/mellanox/mlx4/cq.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/cq.c b/drivers/net/ethernet/mellanox/mlx4/cq.c
> index f7053a74e6a8..4d4f9cf9facb 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/cq.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/cq.c
> @@ -314,7 +314,8 @@ static int mlx4_init_user_cqes(void *buf, int entries, int cqe_size)
>   			buf += PAGE_SIZE;
>   		}
>   	} else {
> -		err = copy_to_user((void __user *)buf, init_ents, entries * cqe_size) ?
> +		err = copy_to_user((void __user *)buf, init_ents,
> +				   array_size(entries, cqe_size)) ?
>   			-EFAULT : 0;
>   	}
>   

Thanks for your patch.
Reviewed-by: Tariq Toukan <tariqt@xxxxxxxxxx>