The patch below does not apply to the 5.18-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 9c5de246c1dbe785268fc2e83c88624b92e4ec93 Mon Sep 17 00:00:00 2001 From: Casper Andersson casper.casan@gmail.com Date: Thu, 30 Jun 2022 14:22:26 +0200 Subject: [PATCH] net: sparx5: mdb add/del handle non-sparx5 devices

When adding/deleting mdb entries on other net_devices, eg., tap interfaces, it should not crash.

Fixes: 3bacfccdcb2d ("net: sparx5: Add mdb handlers") Signed-off-by: Casper Andersson casper.casan@gmail.com Reviewed-by: Steen Hegelund Steen.Hegelund@microchip.com Link: https://lore.kernel.org/r/20220630122226.316812-1-casper.casan@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_switchdev.c b/drivers/net/ethernet/microchip/sparx5/sparx5_switchdev.c index 3429660cd2e5..5edc8b7176c8 100644 --- a/drivers/net/ethernet/microchip/sparx5/sparx5_switchdev.c +++ b/drivers/net/ethernet/microchip/sparx5/sparx5_switchdev.c @@ -396,6 +396,9 @@ static int sparx5_handle_port_mdb_add(struct net_device *dev, u32 mact_entry; int res, err;

+ if (!sparx5_netdevice_check(dev)) + return -EOPNOTSUPP; + if (netif_is_bridge_master(v->obj.orig_dev)) { sparx5_mact_learn(spx5, PGID_CPU, v->addr, v->vid); return 0; @@ -466,6 +469,9 @@ static int sparx5_handle_port_mdb_del(struct net_device *dev, u32 mact_entry, res, pgid_entry[3]; int err;

+ if (!sparx5_netdevice_check(dev)) + return -EOPNOTSUPP; + if (netif_is_bridge_master(v->obj.orig_dev)) { sparx5_mact_forget(spx5, v->addr, v->vid); return 0;