netdev - Re: [PATCH RFT v2 net-next] net: mdio: ensure the type of mdio devices match mdio drivers

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Message-ID: <YVrs9PXicszhOfDB@lunn.ch>
Date:   Mon, 4 Oct 2021 14:00:52 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH RFT v2 net-next] net: mdio: ensure the type of mdio
 devices match mdio drivers

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@...linux.org.uk>

Tested-by: Andrew Lunn <andrew@...n.ch>
Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew