net: dsa: lantiq_gswip: fix use after free in gswip_remove()

commit 8c6ae46150a453f8ae9a6cd49b45f354f478587d upstream.

of_node_put(priv->ds->slave_mii_bus->dev.of_node) should be
done before mdiobus_free(priv->ds->slave_mii_bus).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Fixes: 0d120dfb5d67 ("net: dsa: lantiq_gswip: don't use devres for mdiobus")
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/1644921768-26477-1-git-send-email-khoroshilov@ispras.ru
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index 503adf0..9e006a2 100644 (file)
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -2201,8 +2201,8 @@ static int gswip_remove(struct platform_device *pdev)
 
        if (priv->ds->slave_mii_bus) {
                mdiobus_unregister(priv->ds->slave_mii_bus);
-               mdiobus_free(priv->ds->slave_mii_bus);
                of_node_put(priv->ds->slave_mii_bus->dev.of_node);
+               mdiobus_free(priv->ds->slave_mii_bus);
        }
 
        for (i = 0; i < priv->num_gphy_fw; i++)