linux-kernel - Re: [PATCH] gpio: cdev: sanitize the label before requesting the interrupt

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Message-ID: <f529d746-f8c5-466b-860b-e2bfaeb2cc27@moroto.mountain>
Date: Fri, 22 Mar 2024 12:31:36 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Kent Gibson <warthog618@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alexey Dobriyan <adobriyan@...il.com>,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	stable@...r.kernel.org, Stefan Wahren <wahrenst@....net>
Subject: Re: [PATCH] gpio: cdev: sanitize the label before requesting the
 interrupt

On Fri, Mar 22, 2024 at 08:46:50AM +0100, Bartosz Golaszewski wrote:
> On Fri, Mar 22, 2024 at 2:30 AM Kent Gibson <warthog618@...il.com> wrote:
> >
> > On Wed, Mar 20, 2024 at 01:59:44PM +0100, Bartosz Golaszewski wrote:
> > > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> > >
> > > Let's replace all "/" with "-".
> > >
> >
> > I actually prefer the ":" you originally suggested, as it more clearly
> > indicates a tier separation, whereas a hyphen is commonly used for
> > multi-word names. And as the hyphen is more commonly used the sanitized
> > name is more likely to conflict.
> >
> 
> Sounds good, will do.
> > >
> > > +     label = make_irq_label(le->label);
> > > +     if (!label)
> > > +             goto out_free_le;
> > > +
> >
> > Need to set ret = -ENOMEM before the goto, else you will return 0.
> >
> 
> Eek, right, thanks.

Smatch has a warning about this, btw.
drivers/gpio/gpiolib-cdev.c:2221 lineevent_create() warn: missing error code 'ret'

The other warning here is:
drivers/gpio/gpiolib-cdev.c:2269 lineevent_create() warn: 'irq' from request_threaded_irq() not released on lines: 2258.

regards,
dan carpenter