linux-kernel - [PATCH V2] net: mdio: thunder: Fix a double free issue in the .remove function

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Message-Id: <f8ad9a9e6d7df4cb02731a71a418acca18353380.1620890611.git.christophe.jaillet@wanadoo.fr>
Date:   Thu, 13 May 2021 09:44:49 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
        davem@...emloft.net, kuba@...nel.org, david.daney@...ium.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH V2] net: mdio: thunder: Fix a double free issue in the .remove function

'bus->mii_bus' have been allocated with 'devm_mdiobus_alloc_size()' in the
probe function. So it must not be freed explicitly or there will be a
double free.

Remove the incorrect 'mdiobus_free' in the remove function.

Fixes: 379d7ac7ca31 ("phy: mdio-thunder: Add driver for Cavium Thunder SoC MDIO buses.")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
v2: indicate in the subject which mdio bus driver has a double free
---
 drivers/net/mdio/mdio-thunder.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/mdio/mdio-thunder.c b/drivers/net/mdio/mdio-thunder.c
index cb1761693b69..822d2cdd2f35 100644
--- a/drivers/net/mdio/mdio-thunder.c
+++ b/drivers/net/mdio/mdio-thunder.c
@@ -126,7 +126,6 @@ static void thunder_mdiobus_pci_remove(struct pci_dev *pdev)
 			continue;
 
 		mdiobus_unregister(bus->mii_bus);
-		mdiobus_free(bus->mii_bus);
 		oct_mdio_writeq(0, bus->register_base + SMI_EN);
 	}
 	pci_release_regions(pdev);
-- 
2.30.2