On Wed, Jun 21, 2023 at 03:04:14PM +0100, Florian Fainelli wrote:
> Hi Andrew,
>
> On 6/17/2023 4:55 PM, Andrew Lunn wrote:
> > If the core is left to remove the LEDs via devm_, it is performed too
> > late, after the PHY driver is removed from the PHY. This results in
> > dereferencing a NULL pointer when the LED core tries to turn the LED
> > off before destroying the LED.
> >
> > Manually unregister the LEDs at a safe point in phy_remove.
> >
> > Cc: stable@xxxxxxxxxxxxxxx
> > Reported-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
> > Suggested-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
> > Fixes: 01e5b728e9e4 ("net: phy: Add a binding for PHY LEDs")
> > Signed-off-by: Andrew Lunn <andrew@xxxxxxx>
>
> Thanks for fixing this, this is an improvement, though I can still hit
> another sort of use after free whereby the GENET driver removes the
> mdio-bcm-unimac platform device and eventually cuts the clock to the MDIO
> block thus causing the following:
Hi Florian,
Can you try setting trigger_data->led_cdev to NULL after the
cancel_delayed_work_sync() in netdev_trig_deactivate() and see
what the effect is?
Thanks.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
