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phylib: fix potential use-after-free

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[ Upstream commit cbda1b1668 ]

Commit bafbdd527d ("phylib: Add device reset GPIO support") added call
to phy_device_reset(phydev) after the put_device() call in phy_detach().

The comment before the put_device() call says that the phydev might go
away with put_device().

Fix potential use-after-free by calling phy_device_reset() before
put_device().

Fixes: bafbdd527d ("phylib: Add device reset GPIO support")
Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20220119162748.32418-1-kabel@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marek Behún
2022-01-19 17:27:48 +01:00
committed by Greg Kroah-Hartman
parent 8b5c9de150
commit 67d271760b
1 changed files with 3 additions and 3 deletions
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6
drivers/net/phy/phy_device.c
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@@ -1166,6 +1166,9 @@ void phy_detach(struct phy_device *phydev)
phydev->mdio.dev.driver == &genphy_driver.mdiodrv.driver)
device_release_driver(&phydev->mdio.dev);
/* Assert the reset signal */
phy_device_reset(phydev, 1);
/*
* The phydev might go away on the put_device() below, so avoid
* a use-after-free bug by reading the underlying bus first.
@@ -1175,9 +1178,6 @@ void phy_detach(struct phy_device *phydev)
put_device(&phydev->mdio.dev);
if (ndev_owner != bus->owner)
module_put(bus->owner);
/* Assert the reset signal */
phy_device_reset(phydev, 1);
}
EXPORT_SYMBOL(phy_detach);