Commit 5427e399 authored by Florian Fainelli's avatar Florian Fainelli Committed by Greg Kroah-Hartman

net: phy: Avoid NPD upon phy_detach() when driver is unbound

[ Upstream commit c2b727df ]

If we have unbound the PHY driver prior to calling phy_detach() (often
via phy_disconnect()) then we can cause a NULL pointer de-reference
accessing the driver owner member. The steps to reproduce are:

echo unimac-mdio-0:01 > /sys/class/net/eth0/phydev/driver/unbind
ip link set eth0 down

Fixes: cafe8df8 ("net: phy: Fix lack of reference count on PHY driver")
Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1f029a2b
......@@ -1013,6 +1013,7 @@ void phy_detach(struct phy_device *phydev)
phydev->attached_dev = NULL;
phy_suspend(phydev);
if (phydev->mdio.dev.driver)
module_put(phydev->mdio.dev.driver->owner);
/* If the device had no specific driver before (i.e. - it
......
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