linux-kernel - [PATCH] net: dsa: lantiq_gswip: fix use after free in gswip

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Message-Id: <1644921768-26477-1-git-send-email-khoroshilov@ispras.ru>
Date:   Tue, 15 Feb 2022 13:42:48 +0300
From:   Alexey Khoroshilov <khoroshilov@...ras.ru>
To:     Vladimir Oltean <vladimir.oltean@....com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Alexey Khoroshilov <khoroshilov@...ras.ru>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH] net: dsa: lantiq_gswip: fix use after free in gswip_remove()

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@...ras.ru>
Fixes: 0d120dfb5d67 ("net: dsa: lantiq_gswip: don't use devres for mdiobus")
---
 drivers/net/dsa/lantiq_gswip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index 320ee7fe91a8..8a7a8093a156 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -2176,8 +2176,8 @@ 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++)
-- 
2.7.4