[PATCH] IOMUX: Fix access past end of console_devices

[Andy Shevchenko]

On Wed, Mar 30, 2022 at 8:01 PM Andy Shevchenko
<andy.shevchenko at gmail.com> wrote:
> On Wed, Mar 30, 2022 at 7:49 PM Sean Anderson <seanga2 at gmail.com> wrote:

...

> >  #define for_each_console_dev(i, file, dev)             \
> > -       for (i = 0, dev = console_devices[file][i];     \
>
> When we enter the loop, the dev is assigned and perhaps valid
>
> > -            i < cd_count[file];                        \
> > -            i++, dev = console_devices[file][i])
> > +       for (i = 0; i < cd_count[file] &&               \
>
> Not the case anymore.
>
> > +               (dev = console_devices[file][i]); i++)

On the second look, it seems a bit unusual, but for loop checks the
condition before entering and in such case the dev will be assigned if
the count is greater than 0.
So, basically the difference is that dev is left completely
uninitialized in case of count==0. However, it may not be a problem.

Anyways, I would rather see better written for-loop that we see the iterations


-- 
With Best Regards,
Andy Shevchenko