netdev - Re: [PATCH net] net: phy: Fix PHY module checks and NULL deref in phy_attach

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Date:   Thu, 09 Feb 2017 16:22:35 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     f.fainelli@...il.com
Cc:     netdev@...r.kernel.org, maowenan@...wei.com, andrew@...n.ch,
        rmk+kernel@...linux.org.uk, festevam@...il.com,
        nikita.yoush@...entembedded.com
Subject: Re: [PATCH net] net: phy: Fix PHY module checks and NULL deref in
 phy_attach_direct()

From: Florian Fainelli <f.fainelli@...il.com>
Date: Wed,  8 Feb 2017 19:05:26 -0800

> The Generic PHY drivers gets assigned after we checked that the current
> PHY driver is NULL, so we need to check a few things before we can
> safely dereference d->driver. This would be causing a NULL deference to
> occur when a system binds to the Generic PHY driver. Update
> phy_attach_direct() to do the following:
> 
> - grab the driver module reference after we have assigned the Generic
>   PHY drivers accordingly, and remember we came from the generic PHY
>   path
> 
> - update the error path to clean up the module reference in case the
>   Generic PHY probe function fails
> 
> - split the error path involving phy_detacht() to avoid double free/put
>   since phy_detach() does all the clean up
> 
> - finally, have phy_detach() drop the module reference count before we
>   call device_release_driver() for the Generic PHY driver case
> 
> Fixes: cafe8df8b9bc ("net: phy: Fix lack of reference count on PHY driver")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

Applied to 'net', thanks Florian.