* [PATCH RFT v2 net-next] net: mdio: ensure the type of mdio devices match mdio drivers
@ 2021-10-01 10:00 Russell King (Oracle)
2021-10-04 12:00 ` Andrew Lunn
0 siblings, 1 reply; 2+ messages in thread
From: Russell King (Oracle) @ 2021-10-01 10:00 UTC (permalink / raw)
To: Andrew Lunn, Heiner Kallweit; +Cc: David S. Miller, netdev, Jakub Kicinski
On the MDIO bus, we have PHYLIB devices and drivers, and we have non-
PHYLIB devices and drivers. PHYLIB devices are MDIO devices that are
wrapped with a struct phy_device.
Trying to bind a MDIO device with a PHYLIB driver results in out-of-
bounds accesses as we attempt to access struct phy_device members. So,
let's prevent this by ensuring that the type of the MDIO device
(indicated by the MDIO_DEVICE_FLAG_PHY flag) matches the type of the
MDIO driver (indicated by the MDIO_DEVICE_IS_PHY flag.)
Link: https://lore.kernel.org/r/2b1dc053-8c9a-e3e4-b450-eecdfca3fe16@gmail.com
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
Tested locally in SolidRun Clearfog, DSA switch and PHY get probed
correctly. Further testing welcomed.
v2: dead christmas tree ordering.
drivers/net/phy/mdio_bus.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 53f034fc2ef7..3a36b463c22a 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -938,8 +938,14 @@ EXPORT_SYMBOL_GPL(mdiobus_modify);
*/
static int mdio_bus_match(struct device *dev, struct device_driver *drv)
{
+ struct mdio_driver *mdiodrv = to_mdio_driver(drv);
struct mdio_device *mdio = to_mdio_device(dev);
+ /* Both the driver and device must type-match */
+ if (!(mdiodrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY) !=
+ !(mdio->flags & MDIO_DEVICE_FLAG_PHY))
+ return 0;
+
if (of_driver_match_device(dev, drv))
return 1;
--
2.30.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH RFT v2 net-next] net: mdio: ensure the type of mdio devices match mdio drivers
2021-10-01 10:00 [PATCH RFT v2 net-next] net: mdio: ensure the type of mdio devices match mdio drivers Russell King (Oracle)
@ 2021-10-04 12:00 ` Andrew Lunn
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Lunn @ 2021-10-04 12:00 UTC (permalink / raw)
To: Russell King (Oracle)
Cc: Heiner Kallweit, David S. Miller, netdev, Jakub Kicinski
On Fri, Oct 01, 2021 at 11:00:41AM +0100, Russell King (Oracle) wrote:
> On the MDIO bus, we have PHYLIB devices and drivers, and we have non-
> PHYLIB devices and drivers. PHYLIB devices are MDIO devices that are
> wrapped with a struct phy_device.
>
> Trying to bind a MDIO device with a PHYLIB driver results in out-of-
> bounds accesses as we attempt to access struct phy_device members. So,
> let's prevent this by ensuring that the type of the MDIO device
> (indicated by the MDIO_DEVICE_FLAG_PHY flag) matches the type of the
> MDIO driver (indicated by the MDIO_DEVICE_IS_PHY flag.)
>
> Link: https://lore.kernel.org/r/2b1dc053-8c9a-e3e4-b450-eecdfca3fe16@gmail.com
> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Andrew
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2021-10-04 12:00 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-10-01 10:00 [PATCH RFT v2 net-next] net: mdio: ensure the type of mdio devices match mdio drivers Russell King (Oracle)
2021-10-04 12:00 ` Andrew Lunn
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.