linux-kernel - [PATCH 5.18 095/102] net: sparx5: mdb add/del handle non-sparx5 devices

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Date:   Tue,  5 Jul 2022 13:59:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Casper Andersson <casper.casan@...il.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 095/102] net: sparx5: mdb add/del handle non-sparx5 devices

From: Casper Andersson <casper.casan@...il.com>

[ Upstream commit 9c5de246c1dbe785268fc2e83c88624b92e4ec93 ]

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@...il.com>
Reviewed-by: Steen Hegelund <Steen.Hegelund@...rochip.com>
Link: https://lore.kernel.org/r/20220630122226.316812-1-casper.casan@gmail.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/microchip/sparx5/sparx5_switchdev.c | 6 ++++++
 1 file changed, 6 insertions(+)

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;
-- 
2.35.1