vdpa/mlx5: Fix pointer math in mlx5_vdpa_get_config()

There is a pointer math bug here so if "offset" is non-zero then this
will copy memory from beyond the end of the array.

Fixes: 1a86b377 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20200808093241.GB115053@mwandaSigned-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Eli Cohen <elic@nvidia.com>
Cc: Jason Wang <jasowang@redhat.com>; Parav Pandit <parav@mellanox.com>; virtualization@lists.linux-foundation.org; linux-kernel@vger.kernel.org; kernel-janitors@vger.kernel.org
Fixes: 1a86b377 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

drivers/vdpa/mlx5/net/mlx5_vnet.c

@@ -1757,7 +1757,7 @@ static void mlx5_vdpa_get_config(struct vdpa_device *vdev, unsigned int offset,
 	struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
 
 	if (offset + len < sizeof(struct virtio_net_config))
-		memcpy(buf, &ndev->config + offset, len);
+		memcpy(buf, (u8 *)&ndev->config + offset, len);
 }
 
 static void mlx5_vdpa_set_config(struct vdpa_device *vdev, unsigned int offset, const void *buf,