linux-kernel - Re: [PATCH] ARM: davinci: DA8XX: fix oops in USB PHY driver due to stack allocated platform platform

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Date:   Fri, 16 Mar 2018 10:20:36 -0500
From:   David Lechner <david@...hnology.com>
To:     Sekhar Nori <nsekhar@...com>, linux-arm-kernel@...ts.infradead.org
Cc:     Kevin Hilman <khilman@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: davinci: DA8XX: fix oops in USB PHY driver due to
 stack allocated platform platform_data

On 03/16/2018 05:17 AM, Sekhar Nori wrote:
> On Thursday 15 March 2018 11:32 PM, David Lechner wrote:
>> This fixes a possible kernel oops due to using stack allocated platform
>> data for the USB PHY driver on DA8XX devices. If the platform device
>> probe is deferred, then we get a corrupt pointer for the platform data.
>>
>> We now use a global static struct for the platform data so that the
>> platform data pointer does not get written over.
>>
>> Tested on OMAP-L138 LCDK board using legacy board file.
> 
> Oops. That should have been caught in review.
> 
>>
>> Fixes: 9b504750923cb ("ARM: davinci: da8xx: Add USB PHY platform device")
> 
> The offending commit seems to be bdec5a6b5789 ("ARM: da8xx: use platform
> data for CFGCHIP syscon regmap") in my tree which should be in
> linux-next. I don't think we have this issue in mainline. Right?

You are right. I'm not sure how I got that older commit. The issue is not
in mainline yet.

> 
>> Signed-off-by: David Lechner <david@...hnology.com>
> 
> Thanks,
> Sekhar
>