Re: [PATCH v2 net-next] net: dsa: Never offload FDB entries on standalone ports

[Vladimir Oltean]

On Wed, Mar 16, 2022 at 12:30:33AM +0100, Tobias Waldekranz wrote:
> If a port joins a bridge that it can't offload, it will fallback to
> standalone mode and software bridging. In this case, we never want to
> offload any FDB entries to hardware either.
> 
> Previously, for host addresses, we would eventually end up in
> dsa_port_bridge_host_fdb_add, which would unconditionally dereference
> dp->bridge and cause a segfault.
> 
> Fixes: c26933639b54 ("net: dsa: request drivers to perform FDB isolation")
> Signed-off-by: Tobias Waldekranz <tobias@xxxxxxxxxxxxxx>
> ---

Reviewed-by: Vladimir Oltean <olteanv@xxxxxxxxx>

>  net/dsa/slave.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/net/dsa/slave.c b/net/dsa/slave.c
> index f9cecda791d5..d24b6bf845c1 100644
> --- a/net/dsa/slave.c
> +++ b/net/dsa/slave.c
> @@ -2847,6 +2847,9 @@ static int dsa_slave_fdb_event(struct net_device *dev,
>  	if (ctx && ctx != dp)
>  		return 0;
>  
> +	if (!dp->bridge)
> +		return 0;
> +
>  	if (switchdev_fdb_is_dynamically_learned(fdb_info)) {
>  		if (dsa_port_offloads_bridge_port(dp, orig_dev))
>  			return 0;
> -- 
> 2.25.1
>