linux-kernel - Re: [PATCH] spi: pxa2xx: Add missed security checks

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Message-ID: <CANhBUQ2WJaFrk5JBDbTjaTM5mv0ebwdcHBoR8ODm28X_mOukLA@mail.gmail.com>
Date:   Mon, 28 Oct 2019 09:38:00 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Mark Brown <broonie@...nel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] spi: pxa2xx: Add missed security checks

On Fri, Oct 18, 2019 at 10:04 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Fri, Oct 18, 2019 at 2:37 PM Chuhong Yuan <hslester96@...il.com> wrote:
> > On Fri, Oct 18, 2019 at 7:14 PM Andy Shevchenko
> > <andy.shevchenko@...il.com> wrote:
> > > On Fri, Oct 18, 2019 at 1:39 PM Chuhong Yuan <hslester96@...il.com> wrote:
> > > > On Fri, Oct 18, 2019 at 5:35 PM Andy Shevchenko
> > > > <andy.shevchenko@...il.com> wrote:
> > > > > On Fri, Oct 18, 2019 at 8:59 AM Chuhong Yuan <hslester96@...il.com> wrote:
>
> > > > > I'm not sure they are mandatory for all platforms.
> > > > > To be on the safe side, you simple need to add _optional() to the both
> > > > > call along with above change.
> > > > >
> > > >
> > > > As I know, this is the only one in spi which does not have a check for
> > > > devm_clk_get.
> > >
> > > For some it still may be optional. That's why better to check it and
> > > mention in the commit message.
> > >
> > > > Even if add _optional(), they still may return errors and need security checks.
> > >
> > > Of course, see "along with" in my previous comment.
> > >
> >
> > Got it. I will send version 2 in which both _optional() and security
> > checks will be added.
>
> Let me be clear. I didn't check if _optional() needed or not. You need
> to investigate this before sending new verison.
> And in either case this should be explained in commit message.
>

I have checked this file again and found ssp->clk is used by clk_get_rate in
pxa2xx_spi_probe.
Therefore, it should not be NULL and _optional cannot be used here.
Besides, ssp->irq is also used in pxa2xx_spi_probe.
Hence, I think this patch is fine.

Regards,
Chuhong

> --
> With Best Regards,
> Andy Shevchenko