ACK: [PATCH] [bionic] net/mlx5e: Don't attempt to dereference the ppriv struct if not being eswitch manager

[Stefan Bader]

On 21.10.18 14:53, Talat Batheesh wrote:
> From: Or Gerlitz <ogerlitz at mellanox.com>
> 
> BugLink:  http://bugs.launchpad.net/bugs/1799049
> 
> The check for cpu hit statistics was not returning immediate false for
> any non vport rep netdev and hence we crashed (say on mlx5 probed VFs) if
> user-space tool was calling into any possible netdev in the system.
> 
> Fix that by doing a proper check before dereferencing.
> 
> Fixes: 1d447a39142e ('net/mlx5e: Extendable vport representor netdev private data')
> Signed-off-by: Or Gerlitz <ogerlitz at mellanox.com>
> Reported-by: Eli Cohen <eli at melloanox.com>
> Reviewed-by: Eli Cohen <eli at melloanox.com>
> Signed-off-by: Saeed Mahameed <saeedm at mellanox.com>
> (cherry picked from commit 8ffd569aaa818f2624ca821d9a246342fa8b8c50)
> Signed-off-by: Talat Batheesh <talatb at mellanox.com>
Acked-by: Stefan Bader <stefan.bader at canonical.com>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/en_rep.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
> index f72abdeb6d08..9ebe78ec99f0 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
> @@ -750,8 +750,12 @@ bool mlx5e_is_uplink_rep(struct mlx5e_priv *priv)
>  static bool mlx5e_is_vf_vport_rep(struct mlx5e_priv *priv)
>  {
>  	struct mlx5e_rep_priv *rpriv = priv->ppriv;
> -	struct mlx5_eswitch_rep *rep = rpriv->rep;
> +	struct mlx5_eswitch_rep *rep;
>  
> +	if (!MLX5_CAP_GEN(priv->mdev, eswitch_flow_table))
> +		return false;
> +
> +	rep = rpriv->rep;
>  	if (rep && rep->vport != FDB_UPLINK_VPORT)
>  		return true;
>  
> 


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