vdpa/mlx5: fix param validation in mlx5_vdpa_get_config()

commit dcfde1635e764fd69cc756c7780d144e288608e9 upstream.

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>
Link: https://lore.kernel.org/r/20210208161741.104939-1-sgarzare@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Eli Cohen <elic@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index c6529f7..5a86ede 100644 (file)
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1805,7 +1805,7 @@ 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);
 }