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

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Message-ID: <CANhBUQ1CnCHiY8tkCMcXZ3DAPcfnQZgfA_Fj4qf3yYBKGg10Wg@mail.gmail.com>
Date:   Fri, 18 Oct 2019 19:37:00 +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 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:
> > > >
> > > > pxa2xx_spi_init_pdata misses checks for devm_clk_get and
> > > > platform_get_irq.
> > > > Add checks for them to fix the bugs.
> > > >
> > > > Signed-off-by: Chuhong Yuan <hslester96@...il.com>
> > > > ---
> > > >  drivers/spi/spi-pxa2xx.c | 6 ++++++
> > > >  1 file changed, 6 insertions(+)
> > > >
> > > > diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
> > > > index bb6a14d1ab0f..2e73d75a6ac5 100644
> > > > --- a/drivers/spi/spi-pxa2xx.c
> > > > +++ b/drivers/spi/spi-pxa2xx.c
> > > > @@ -1565,7 +1565,13 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev)
> > > >  #endif
> > > >
> > > >         ssp->clk = devm_clk_get(&pdev->dev, NULL);
> > > > +       if (IS_ERR(ssp->clk))
> > > > +               return NULL;
> > > > +
> > > >         ssp->irq = platform_get_irq(pdev, 0);
> > > > +       if (ssp->irq < 0)
> > > > +               return NULL;
> > >
> > > 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.

> --
> With Best Regards,
> Andy Shevchenko