linux-hardening - Re: Coverity: nouveau_dp_irq(): Null pointer dereferences

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Date:   Fri, 11 Nov 2022 11:21:49 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Jani Nikula <jani.nikula@...el.com>
Cc:     Lyude Paul <lyude@...hat.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org, Ilia Mirkin <imirkin@...m.mit.edu>,
        Daniel Vetter <daniel@...ll.ch>,
        Karol Herbst <kherbst@...hat.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...il.com>,
        "Nathan E. Egge" <unlord@...h.org>,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        Dave Airlie <airlied@...hat.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        linux-next@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: Coverity: nouveau_dp_irq(): Null pointer dereferences

On Fri, Nov 11, 2022 at 11:13:17AM +0200, Jani Nikula wrote:
> On Thu, 10 Nov 2022, coverity-bot <keescook@...omium.org> wrote:
> > Hello!
> >
> > This is an experimental semi-automated report about issues detected by
> > Coverity from a scan of next-20221110 as part of the linux-next scan project:
> > https://scan.coverity.com/projects/linux-next-weekly-scan
> >
> > You're getting this email because you were associated with the identified
> > lines of code (noted below) that were touched by commits:
> >
> >   Mon Aug 31 19:10:08 2020 -0400
> >     a0922278f83e ("drm/nouveau/kms/nv50-: Refactor and cleanup DP HPD handling")
> 
> Hi Kees, this looks like a good idea, but maybe double check the Cc list
> generation? I was Cc'd on four mails today that I thought were
> irrelevant to me.

Hi!

Heh, I was recently asked to _expand_ the CC list. :)

For these last pass of reports, I added a get_maintainers.pl run to the
identified commit. In this instance, the commit touched:

 drivers/gpu/drm/nouveau/dispnv04/disp.c     |    6 +
 drivers/gpu/drm/nouveau/dispnv50/disp.c     |  192 ++++++++++++++++++++++--------------------------
 drivers/gpu/drm/nouveau/nouveau_connector.c |   14 ---
 drivers/gpu/drm/nouveau/nouveau_display.c   |    2 
 drivers/gpu/drm/nouveau/nouveau_display.h   |    2 
 drivers/gpu/drm/nouveau/nouveau_dp.c        |  132 ++++++++++++++++++++++++++++-----
 drivers/gpu/drm/nouveau/nouveau_encoder.h   |   33 +++++++-
 7 files changed, 244 insertions(+), 137 deletions(-)

And the get_maintainers.pl rationale was:

Ben Skeggs <bskeggs@...hat.com> (supporter:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS,commit_signer:1/1=100%,commit_signer:6/16=38%,authored:4/16=25%,added_lines:23/124=19%,removed_lines:36/152=24%)
Karol Herbst <kherbst@...hat.com> (supporter:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS,commit_signer:2/1=100%)
Lyude Paul <lyude@...hat.com> (supporter:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS,commit_signer:9/16=56%,authored:6/16=38%,added_lines:92/124=74%,removed_lines:107/152=70%)
David Airlie <airlied@...il.com> (maintainer:DRM DRIVERS)
Daniel Vetter <daniel@...ll.ch> (maintainer:DRM DRIVERS)
Ilia Mirkin <imirkin@...m.mit.edu> (commit_signer:1/1=100%,authored:1/1=100%,added_lines:2/2=100%,removed_lines:2/2=100%)
"Nathan E. Egge" <unlord@...h.org> (commit_signer:1/1=100%)
Jani Nikula <jani.nikula@...el.com> (commit_signer:6/16=38%)
Dave Airlie <airlied@...hat.com> (commit_signer:5/16=31%)
Thomas Zimmermann <tzimmermann@...e.de> (commit_signer:4/16=25%,authored:4/16=25%)
dri-devel@...ts.freedesktop.org (open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS)
nouveau@...ts.freedesktop.org (open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS)

-- 
Kees Cook