From: Florian Fainelli <f.fainelli@gmail.com>
To: hs@denx.de
Cc: netdev@vger.kernel.org, maowenan <maowenan@huawei.com>,
andrew@lunn.ch, rmk+kernel@armlinux.org.uk, festevam@gmail.com,
davem@davemloft.net, nikita.yoush@cogentembedded.com
Subject: Re: [net, v3, 1/3] net: phy: Fix PHY module checks and NULL deref in phy_attach_direct()
Date: Wed, 8 Feb 2017 23:13:51 -0800 [thread overview]
Message-ID: <8c63b88f-c7d3-dd53-e3a8-9d38bb5a154c@gmail.com> (raw)
In-Reply-To: <589C1309.5040302@denx.de>
On 02/08/2017 10:58 PM, Heiko Schocher wrote:
> Hello Florian,
>
> Am 09.02.2017 um 01:13 schrieb Florian Fainelli:
>> 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
>>
>> - update the error path to clean up the module reference in case the
>> Generic PHY probe function fails
>>
>> Fixes: cafe8df8b9bc ("net: phy: Fix lack of reference count on PHY
>> driver")
>> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
>> ---
>> drivers/net/phy/phy_device.c | 16 +++++++++++++++-
>> 1 file changed, 15 insertions(+), 1 deletion(-)
>
> just stumbled over this bug on an am335x based board, with an
> KSZ8081 attached, so there a "fixed-link" is used like:
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/am335x-baltos-ir3220.dts#n105
>
>
> With your patch it crashes also ...
The final version of the patch is here:
http://patchwork.ozlabs.org/patch/725923/
Do you mind giving it a try?
--
Florian
next prev parent reply other threads:[~2017-02-09 7:14 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-09 0:13 [PATCH net v3 0/3] net: phy: Fix PHY module checks and NULL deref in phy_attach_direct() Florian Fainelli
2017-02-09 0:13 ` [PATCH net v3 1/3] " Florian Fainelli
2017-02-09 0:15 ` Florian Fainelli
2017-02-09 6:58 ` [net, v3, " Heiko Schocher
2017-02-09 7:13 ` Florian Fainelli [this message]
2017-02-09 7:29 ` Heiko Schocher
2017-02-09 0:14 ` [PATCH net v3 2/3] net: phy: Check phydev->drv Florian Fainelli
2017-02-09 0:14 ` [PATCH net v3 3/3] net: phy: Fix PHY driver bind and unbind events Florian Fainelli
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