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net: dsa: bcm_sf2: Fix a possible memory leak in bcm_sf2_mdio_register()

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[ Upstream commit e3862093ee93fcfbdadcb7957f5f8974fffa806a ]

bcm_sf2_mdio_register() calls of_phy_find_device() and then
phy_device_remove() in a loop to remove existing PHY devices.
of_phy_find_device() eventually calls bus_find_device(), which calls
get_device() on the returned struct device * to increment the refcount.
The current implementation does not decrement the refcount, which causes
memory leak.

This commit adds the missing phy_device_free() call to decrement the
refcount via put_device() to balance the refcount.

Fixes: 771089c2a4 ("net: dsa: bcm_sf2: Ensure that MDIO diversion is used")
Signed-off-by: Joe Hattori <joe@pf.is.s.u-tokyo.ac.jp>
Tested-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://patch.msgid.link/20240806011327.3817861-1-joe@pf.is.s.u-tokyo.ac.jp
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Joe Hattori 2024-08-06 10:13:27 +09:00 committed by Greg Kroah-Hartman
parent 01150020c0
commit b7b8d9f5e6
1 changed files with 3 additions and 1 deletions
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4
drivers/net/dsa/bcm_sf2.c
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@ -558,8 +558,10 @@ static int bcm_sf2_mdio_register(struct dsa_switch *ds)
of_remove_property(child, prop);
phydev = of_phy_find_device(child);
if (phydev)
if (phydev) {
phy_device_remove(phydev);
phy_device_free(phydev);
}
}
err = mdiobus_register(priv->slave_mii_bus);