[PATCH 4.9 56/66] net: mdio: octeon: Fix some double free issues

Greg Kroah-Hartman
2021-05-31T13:33:25Z

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

[ Upstream commit e1d027dd97e1e750669cdc0d3b016a4f54e473eb ]

'bus->mii_bus' has 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 error handling path of the
probe function and in remove function.

Suggested-By: Andrew Lunn <andrew@lunn.ch>
Fixes: 35d2aeac9810 ("phy: mdio-octeon: Use devm_mdiobus_alloc_size()")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/phy/mdio-octeon.c | 2 --
1 file changed, 2 deletions(-)

diff --git a/drivers/net/phy/mdio-octeon.c b/drivers/net/phy/mdio-octeon.c
index ab6914f8bd50..1da104150f44 100644
--- a/drivers/net/phy/mdio-octeon.c
+++ b/drivers/net/phy/mdio-octeon.c
@@ -75,7 +75,6 @@ static int octeon_mdiobus_probe(struct platform_device *pdev)

return 0;
fail_register:
- mdiobus_free(bus->mii_bus);
smi_en.u64 = 0;
oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
return err;
@@ -89,7 +88,6 @@ static int octeon_mdiobus_remove(struct platform_device *pdev)
bus = platform_get_drvdata(pdev);

mdiobus_unregister(bus->mii_bus);
- mdiobus_free(bus->mii_bus);
smi_en.u64 = 0;
oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
return 0;
--
2.30.2