[PATCH net v4] net: airoha: Validate egress gdm port in airoha_ppe_foe_entry_prepare()

[Simon Horman]

On Tue, Apr 01, 2025 at 11:42:30AM +0200, Lorenzo Bianconi wrote:
> Dev pointer in airoha_ppe_foe_entry_prepare routine is not strictly
> a device allocated by airoha_eth driver since it is an egress device
> and the flowtable can contain even wlan, pppoe or vlan devices. E.g:
> 
> flowtable ft {
>         hook ingress priority filter
>         devices = { eth1, lan1, lan2, lan3, lan4, wlan0 }
>         flags offload                               ^
>                                                     |
>                      "not allocated by airoha_eth" --
> }
> 
> In this case airoha_get_dsa_port() will just return the original device
> pointer and we can't assume netdev priv pointer points to an
> airoha_gdm_port struct.
> Fix the issue validating egress gdm port in airoha_ppe_foe_entry_prepare
> routine before accessing net_device priv pointer.
> 
> Fixes: 00a7678310fe ("net: airoha: Introduce flowtable offload support")
> Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
> ---
> Changes in v4:
> - Return bool in airoha_is_valid_gdm_port() instead of int
> - Link to v3: https://lore.kernel.org/r/20250331-airoha-validate-egress-gdm-port-v3-1-c14e6ba9733a@kernel.org

Thanks for the update.

Reviewed-by: Simon Horman <horms at kernel.org>