[PATCH net-next v2] net: airoha: Validate egress gdm port in airoha_ppe_foe_entry_prepare()

[Andrew Lunn]

> Fix the issue validating egress gdm port in airoha_ppe_foe_entry_prepare
> routine.

A more interesting question is, why do you see an invalid port? Is the
hardware broken? Something not correctly configured? Are you just
papering over the crack?

> -static int airoha_ppe_foe_entry_prepare(struct airoha_foe_entry *hwe,
> +static int airoha_ppe_foe_entry_prepare(struct airoha_eth *eth,
> +					struct airoha_foe_entry *hwe,
>  					struct net_device *dev, int type,
>  					struct airoha_flow_data *data,
>  					int l4proto)
> @@ -224,6 +225,11 @@ static int airoha_ppe_foe_entry_prepare(struct airoha_foe_entry *hwe,
>  	if (dev) {
>  		struct airoha_gdm_port *port = netdev_priv(dev);

If port is invalid, is dev also invalid? And if dev is invalid, could
dereferencing it to get priv cause an opps?

	Andrew