Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [PATCH][net-next] net/mlx4: Use array_size() helper in
 copy_to_user()
To:     "Gustavo A. R. Silva" <gustavoars@kernel.org>,
        Tariq Toukan <tariqt@nvidia.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>
Cc:     netdev@vger.kernel.org, linux-rdma@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org
References: <20210928201733.GA268467@embeddedor>
From:   Tariq Toukan <ttoukan.linux@gmail.com>
Message-ID: <283d239b-9af9-d3a3-72be-9138c032ef63@gmail.com>
Date:   Wed, 29 Sep 2021 13:24:05 +0300
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101
 Thunderbird/78.14.0
MIME-Version: 1.0
In-Reply-To: <20210928201733.GA268467@embeddedor>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk


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@kernel.org>
> ---
>   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@nvidia.com>