From 2b12d51c4fa8dab6a879681cbf52f30e667c928c Mon Sep 17 00:00:00 2001 From: "Russell King (Oracle)" Date: Thu, 7 Oct 2021 14:23:32 +0100 Subject: net: phylib: ensure phy device drivers do not match by DT PHYLIB device drivers must match by either numerical PHY ID or by their .match_phy_device method. Matching by DT is not permitted. Link: https://lore.kernel.org/r/2b1dc053-8c9a-e3e4-b450-eecdfca3fe16@gmail.com Tested-by: Andrew Lunn Reviewed-by: Andrew Lunn Signed-off-by: Russell King (Oracle) Signed-off-by: David S. Miller --- drivers/net/phy/phy_device.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/net') diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index ba5ad86ec826..ba295b8ad8fe 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -3146,6 +3146,16 @@ int phy_driver_register(struct phy_driver *new_driver, struct module *owner) return -EINVAL; } + /* PHYLIB device drivers must not match using a DT compatible table + * as this bypasses our checks that the mdiodev that is being matched + * is backed by a struct phy_device. If such a case happens, we will + * make out-of-bounds accesses and lockup in phydev->lock. + */ + if (WARN(new_driver->mdiodrv.driver.of_match_table, + "%s: driver must not provide a DT match table\n", + new_driver->name)) + return -EINVAL; + new_driver->mdiodrv.flags |= MDIO_DEVICE_IS_PHY; new_driver->mdiodrv.driver.name = new_driver->name; new_driver->mdiodrv.driver.bus = &mdio_bus_type; -- cgit v1.2.3