From: Stefano Garzarella sgarzare@redhat.com
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 --- drivers/vdpa/mlx5/net/mlx5_vnet.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- 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 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); }