linux-kernel - Re: [PATCH v2 09/11] gpiolib: provide a dedicated function for setting lineinfo

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Message-ID: <CAHp75VcVUdR5TU3CSp-6vvMGEzRT2S9=05h0jyzTrpiZkUKDUQ@mail.gmail.com>
Date:   Thu, 5 Dec 2019 12:20:54 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Kent Gibson <warthog618@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 09/11] gpiolib: provide a dedicated function for
 setting lineinfo

On Thu, Dec 5, 2019 at 11:28 AM Bartosz Golaszewski
<bgolaszewski@...libre.com> wrote:
> śr., 4 gru 2019 o 23:30 Andy Shevchenko <andy.shevchenko@...il.com> napisał(a):
> > On Wed, Dec 4, 2019 at 6:02 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:

> > > +       if (desc->name) {
> > > +               strncpy(info->name, desc->name, sizeof(info->name));
> > > +               info->name[sizeof(info->name) - 1] = '\0';
> > > +       } else {
> > > +               info->name[0] = '\0';
> > > +       }
> > > +
> > > +       if (desc->label) {
> > > +               strncpy(info->consumer, desc->label, sizeof(info->consumer));
> > > +               info->consumer[sizeof(info->consumer) - 1] = '\0';
> > > +       } else {
> > > +               info->consumer[0] = '\0';
> > > +       }
> >
> > I think we have to fix GCC warnings first and then do whatever this patch does.
> >
>
> What GCC warnings are you referring to exactly?

stncpy() against partial string without NUL-terminator.

So, if desc->label is longer than info->consumer, it will be copied
partially. I don't check if the modern GCC clever enough to see the
next operation which does the termination.

-- 
With Best Regards,
Andy Shevchenko