Coverity: nouveau_dp_irq(): Null pointer dereferences

[Karol Herbst]

On Fri, Nov 11, 2022 at 8:21 PM Kees Cook <keescook at chromium.org> wrote:
>
> On Fri, Nov 11, 2022 at 11:13:17AM +0200, Jani Nikula wrote:
> > On Thu, 10 Nov 2022, coverity-bot <keescook at chromium.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 at redhat.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 at redhat.com> (supporter:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS,commit_signer:2/1=100%)
> Lyude Paul <lyude at redhat.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 at gmail.com> (maintainer:DRM DRIVERS)
> Daniel Vetter <daniel at ffwll.ch> (maintainer:DRM DRIVERS)
> Ilia Mirkin <imirkin at alum.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 at xiph.org> (commit_signer:1/1=100%)
> Jani Nikula <jani.nikula at intel.com> (commit_signer:6/16=38%)
> Dave Airlie <airlied at redhat.com> (commit_signer:5/16=31%)
> Thomas Zimmermann <tzimmermann at suse.de> (commit_signer:4/16=25%,authored:4/16=25%)
> dri-devel at lists.freedesktop.org (open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS)
> nouveau at lists.freedesktop.org (open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS)
>

I'd say it's good enough to message supporters and the mailing lists
for at least Nouveau code, maybe even all drm drivers.

Not sure what to do about actual maintainers, but I doubt Dave and
Daniel want to be CCed on every Coverity report here either.

Karol

>
> --
> Kees Cook
>