linux-kernel - Re: [PATCH] efivarfs: fix NULL-deref on mount when no efivars

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Message-ID: <CAMj1kXHiWBA99KG_OXD12rGH3zk84dii3LWZ6OybahudXp3vwA@mail.gmail.com>
Date:   Fri, 27 Jan 2023 09:38:03 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Jeremy Kerr <jk@...abs.org>,
        Maximilian Luz <luzmaximilian@...il.com>,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Steev Klimaszewski <steev@...i.org>
Subject: Re: [PATCH] efivarfs: fix NULL-deref on mount when no efivars

On Fri, 27 Jan 2023 at 09:28, Johan Hovold <johan@...nel.org> wrote:
>
> On Thu, Jan 26, 2023 at 09:32:27PM +0100, Ard Biesheuvel wrote:
> > On Thu, 26 Jan 2023 at 12:23, Johan Hovold <johan+linaro@...nel.org> wrote:
> > >
> > > The VFS calls kill_sb() also in case mount fails in get_tree().
> > >
> > > Add the missing check to make sure that efivars has been registered also
> > > to kill_sb() to avoid dereferencing a NULL pointer when trying to remove
> > > efivar entries.
> > >
> > > Fixes: c3fd71b428b8 ("efivarfs: always register filesystem")
> > > Reported-by: Steev Klimaszewski <steev@...i.org>
> > > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> >
> > Thanks - I have squashed this with the original patch.
>
> Thanks, Ard. And sorry about not catching this before posting.
>

No worries.