linux-kernel - Re: [PATCH] mdio_bus: Fix use-after-free on device

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Date:   Fri, 22 Feb 2019 15:35:10 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     yuehaibing@...wei.com
Cc:     andrew@...n.ch, f.fainelli@...il.com, hkallweit1@...il.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] mdio_bus: Fix use-after-free on device_register fails

From: Yue Haibing <yuehaibing@...wei.com>
Date: Thu, 21 Feb 2019 22:42:01 +0800

> From: YueHaibing <yuehaibing@...wei.com>
> 
> KASAN has found use-after-free in fixed_mdio_bus_init,
> commit 0c692d07842a ("drivers/net/phy/mdio_bus.c: call
> put_device on device_register() failure") call put_device()
> while device_register() fails,give up the last reference
> to the device and allow mdiobus_release to be executed
> ,kfreeing the bus. However in most drives, mdiobus_free
> be called to free the bus while mdiobus_register fails.
> use-after-free occurs when access bus again, this patch
> revert it to let mdiobus_free free the bus.
> 
> KASAN report details as below:
 ...
> Fixes: 0c692d07842a ("drivers/net/phy/mdio_bus.c: call put_device on device_register() failure")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>

Applied and queued up for -stable, thanks.