linux-kernel - Re: [PATCH] gpiolib: cdev: fix null pointer dereference in linereq

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Message-ID: <20220707102918.GA60169@sol>
Date:   Thu, 7 Jul 2022 18:29:18 +0800
From:   Kent Gibson <warthog618@...il.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH] gpiolib: cdev: fix null pointer dereference in
 linereq_free()

On Thu, Jul 07, 2022 at 12:19:15PM +0200, Bartosz Golaszewski wrote:
> On Thu, Jul 7, 2022 at 11:00 AM Kent Gibson <warthog618@...il.com> wrote:
> >
> > On Wed, Jul 06, 2022 at 04:50:25PM +0800, Kent Gibson wrote:
> > > On Wed, Jul 06, 2022 at 04:45:07PM +0800, Kent Gibson wrote:
> > > > This patch fixes a kernel NULL pointer dereference that is reported by
> > > > gpio kselftests.
> > > >
> > >
> > > Should be:
> > >
> > > Fix a kernel NULL pointer dereference reported by gpio kselftests.
> > >
> > > Sorry - I rushed this one a bit.
> > >
> >
> > And I might not've been totally clear, but this bug is present in
> > v5.19-rc1 onwards (when HTE was added), up to and including rc5.
> >
> > Would be good to get it fixed before v5.19 goes out the door.
> >
> > Cheers,
> > Kent.
> 
> Yep, figured that out. Applied and fixed the commit message, thanks!
> 

Good to hear.  I never got around to reviewing that final HTE patch
and, while it did end up pretty close to what I expected, there are a
few things that I would've done slightly differently that I'd like to
tidy up.
And also have the HTE specific code compiled out unless CONFIG_HTE is
selected, as that is very likely to be the case for most builds.
But that can wait for v5.20.

Cheers,
Kent.