Re: [PATCH] gpio: cdev: check for NULL labels when sanitizing them for irqs

[Kent Gibson]

On Wed, Apr 03, 2024 at 11:47:21AM +0200, Bartosz Golaszewski wrote:
> On Wed, Apr 3, 2024 at 11:42 AM Kent Gibson <warthog618@xxxxxxxxx> wrote:
> >
> >
> > It occurred to me that none of my tests cover this case, as they always
> > request edges with the consumer set, so I added some and can confirm both
> > the problem and the fix.
> >
> > In the process I found another bug - we overlooked setting up the irq
> > label in debounce_setup() - the alternate path in edge_detector_setup()
> > that performs sw debounce.  That results in a double free of the
> > req->label and memory corruption hilarity follows.
> >
> > I've got a patch for that - the unfortunate part being that
> > debounce_setup() is earlier in the file than make_irq_label() and
> > free_irq_label().  Those will need to be pushed earlier, so it is
> > sure to conflict with this patch.
> > How would you prefer to proceed?
>
> Can you take my patch and just make it part of your series?
>

Will do.

Cheers,
Kent.