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Subject: Re: [PATCH] vdpa/mlx5: fix param validation in mlx5_vdpa_get_config()
To:     Stefano Garzarella <sgarzare@redhat.com>,
        virtualization@lists.linux-foundation.org
Cc:     "Michael S. Tsirkin" <mst@redhat.com>,
        Parav Pandit <parav@nvidia.com>, Eli Cohen <elic@nvidia.com>,
        linux-kernel@vger.kernel.org
References: <20210208161741.104939-1-sgarzare@redhat.com>
From:   Jason Wang <jasowang@redhat.com>
Message-ID: <8081249b-47be-341a-f979-3bcc30ed41cb@redhat.com>
Date:   Tue, 9 Feb 2021 11:21:52 +0800
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On 2021/2/9 上午12:17, Stefano Garzarella wrote:
> It's legal to have 'offset + len' equal to
> sizeof(struct virtio_net_config), since 'ndev->config' is a
> 'struct virtio_net_config', so we can safely copy its content under
> this condition.
>
> Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices")
> Cc: stable@vger.kernel.org
> Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>


Acked-by: Jason Wang <jasowang@redhat.com>


> ---
>   drivers/vdpa/mlx5/net/mlx5_vnet.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index dc88559a8d49..10e9b09932eb 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -1820,7 +1820,7 @@ static void mlx5_vdpa_get_config(struct vdpa_device *vdev, unsigned int offset,
>   	struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
>   	struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
>   
> -	if (offset + len < sizeof(struct virtio_net_config))
> +	if (offset + len <= sizeof(struct virtio_net_config))
>   		memcpy(buf, (u8 *)&ndev->config + offset, len);
>   }
>