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vdpa/mlx5: fix param validation in mlx5_vdpa_get_config()

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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: 1a86b377aa ("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>
This commit is contained in:
Stefano Garzarella 2021-02-08 17:17:41 +01:00 committed by Greg Kroah-Hartman
parent 070d0094b3
commit 2a7e48dc38
1 changed files with 1 additions and 1 deletions
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2
drivers/vdpa/mlx5/net/mlx5_vnet.c
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@ -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);
}