On Tue, Nov 22, 2022 at 04:04:53PM +0300, Peter Kosyh wrote:
> Use snprintf() to avoid the potential buffer overflow. Although in the
> current code this is hardly possible, the safety is unclean.
Let's fix the tools instead. The kernel code is correct.
Thanks
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Signed-off-by: Peter Kosyh <pkosyh@xxxxxxxxx>
> ---
> drivers/net/ethernet/mellanox/mlx4/main.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
> index d3fc86cd3c1d..0616d352451b 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/main.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/main.c
> @@ -3057,7 +3057,8 @@ static int mlx4_init_port_info(struct mlx4_dev *dev, int port)
> info->base_qpn = mlx4_get_base_qpn(dev, port);
> }
>
> - sprintf(info->dev_name, "mlx4_port%d", port);
> + snprintf(info->dev_name, sizeof(info->dev_name),
> + "mlx4_port%d", port);
> info->port_attr.attr.name = info->dev_name;
> if (mlx4_is_mfunc(dev)) {
> info->port_attr.attr.mode = 0444;
> @@ -3077,7 +3078,8 @@ static int mlx4_init_port_info(struct mlx4_dev *dev, int port)
> return err;
> }
>
> - sprintf(info->dev_mtu_name, "mlx4_port%d_mtu", port);
> + snprintf(info->dev_mtu_name, sizeof(info->dev_mtu_name),
> + "mlx4_port%d_mtu", port);
> info->port_mtu_attr.attr.name = info->dev_mtu_name;
> if (mlx4_is_mfunc(dev)) {
> info->port_mtu_attr.attr.mode = 0444;
> --
> 2.38.1
>
