linux-kernel - Re: [PATCH v1] Input: edt-ft5x06

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Message-ID: <20200409123622.GA3676135@smile.fi.intel.com>
Date:   Thu, 9 Apr 2020 15:36:22 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Oliver Graute <oliver.graute@...il.com>
Cc:     Marco Felsch <m.felsch@...gutronix.de>, dmitry.torokhov@...il.com,
        Oliver Graute <oliver.graute@...oconnector.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] Input: edt-ft5x06 - fix crash on EDT EP0110M09

On Thu, Apr 09, 2020 at 02:02:42PM +0200, Oliver Graute wrote:
> On 09/04/20, Marco Felsch wrote:
> > Hi Oliver,
> > 
> > thanks for your patch.
> > 
> > On 20-04-09 11:27, Oliver Graute wrote:
> > > From: Oliver Graute <oliver.graute@...oconnector.com>
> > 
> > ...
> > 
> > >  drivers/input/touchscreen/edt-ft5x06.c | 4 ----
> > >  1 file changed, 4 deletions(-)
> > > 
> > > diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
> > > index 06aa8ba0b6d7..6fbc87d041a1 100644
> > > --- a/drivers/input/touchscreen/edt-ft5x06.c
> > > +++ b/drivers/input/touchscreen/edt-ft5x06.c
> > > @@ -819,10 +819,6 @@ static int edt_ft5x06_ts_identify(struct i2c_client *client,
> > >  	 * to have garbage in there
> > >  	 */
> > >  	memset(rdbuf, 0, sizeof(rdbuf));
> > > -	error = edt_ft5x06_ts_readwrite(client, 1, "\xBB",
> > > -					EDT_NAME_LEN - 1, rdbuf);
> > > -	if (error)
> > > -		return error;
> > 
> > 
> > I don't see how this call can corrupt the stack..
> 
> I admit that this is strange. The patch fixed my problems so I posted
> it. Still interested in the root-cause.

I'm wondering how you nailed down to this function? Have you able to use kASAN?

By the way, what I²C controller behind this? Maybe the bug in its driver?

-- 
With Best Regards,
Andy Shevchenko