From: Ido Schimmel <idosch@mellanox.com>
Date: Mon, 20 Jun 2016 21:04:00 +0000 (+0200)
Subject: mlxsw: spectrum: Sanitize port netdev upper devices
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=59fe9b3f842751688d9ee180f673314190813be1;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

mlxsw: spectrum: Sanitize port netdev upper devices

We currently only support the following upper devices for port netdevs:
1) Bridge
2) LAG (bond / team)
3) VLAN

Any other device is forbidden, so return an error.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 3d570086527e..b47e3fb48bf7 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -3034,6 +3034,10 @@ static int mlxsw_sp_netdevice_port_upper_event(struct net_device *dev,
 	switch (event) {
 	case NETDEV_PRECHANGEUPPER:
 		upper_dev = info->upper_dev;
+		if (!is_vlan_dev(upper_dev) &&
+		    !netif_is_lag_master(upper_dev) &&
+		    !netif_is_bridge_master(upper_dev))
+			return -EINVAL;
 		if (!info->master || !info->linking)
 			break;
 		/* HW limitation forbids to put ports to multiple bridges. */
@@ -3070,6 +3074,9 @@ static int mlxsw_sp_netdevice_port_upper_event(struct net_device *dev,
 			else
 				err = mlxsw_sp_port_lag_leave(mlxsw_sp_port,
 							      upper_dev);
+		} else {
+			err = -EINVAL;
+			WARN_ON(1);
 		}
 		break;
 	}