mlxsw: spectrum: Avoid possible NULL pointer dereference

[ Upstream commit c0e01eac7ada785fdeaea1ae5476ec1cf3b00374 ]

In case we got an FDB notification for a port that doesn't exist we
execute an FDB entry delete to prevent it from re-appearing the next
time we poll for notifications.

If the operation failed we would trigger a NULL pointer dereference as
'mlxsw_sp_port' is NULL.

Fix it by reporting the error using the underlying bus device instead.

Fixes: 12f1501e7511 ("mlxsw: spectrum: remove FDB entry in case we get unknown object notification")
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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
index bea9ae3..60e1edc 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
@@ -1448,8 +1448,7 @@ do_fdb_op:
        err = mlxsw_sp_port_fdb_uc_op(mlxsw_sp, local_port, mac, fid,
                                      adding, true);
        if (err) {
-               if (net_ratelimit())
-                       netdev_err(mlxsw_sp_port->dev, "Failed to set FDB entry\n");
+               dev_err_ratelimited(mlxsw_sp->bus_info->dev, "Failed to set FDB entry\n");
                return;
        }
 
@@ -1509,8 +1508,7 @@ do_fdb_op:
        err = mlxsw_sp_port_fdb_uc_lag_op(mlxsw_sp, lag_id, mac, fid, lag_vid,
                                          adding, true);
        if (err) {
-               if (net_ratelimit())
-                       netdev_err(mlxsw_sp_port->dev, "Failed to set FDB entry\n");
+               dev_err_ratelimited(mlxsw_sp->bus_info->dev, "Failed to set FDB entry\n");
                return;
        }