Re: [PATCH] spi: pxa2xx: Add missed security checks

[Chuhong Yuan <hslester96@xxxxxxxxx>]

On Fri, Oct 18, 2019 at 10:04 PM Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
>
> On Fri, Oct 18, 2019 at 2:37 PM Chuhong Yuan <hslester96@xxxxxxxxx> wrote:
> > On Fri, Oct 18, 2019 at 7:14 PM Andy Shevchenko
> > <andy.shevchenko@xxxxxxxxx> wrote:
> > > On Fri, Oct 18, 2019 at 1:39 PM Chuhong Yuan <hslester96@xxxxxxxxx> wrote:
> > > > On Fri, Oct 18, 2019 at 5:35 PM Andy Shevchenko
> > > > <andy.shevchenko@xxxxxxxxx> wrote:
> > > > > On Fri, Oct 18, 2019 at 8:59 AM Chuhong Yuan <hslester96@xxxxxxxxx> 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