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From:   Dave Airlie <airlied@gmail.com>
Date:   Thu, 13 Jul 2023 05:30:49 +1000
Message-ID: <CAPM=9txP3D8p9H=xCvBocFVssH=YP0h12FEOTnuTF7_pEUpRow@mail.gmail.com>
Subject: Re: [PATCH] drm/nouveau/acr: Abort loading ACR if no firmware was found
To:     Karol Herbst <kherbst@redhat.com>
Cc:     linux-kernel@vger.kernel.org, Ben Skeggs <bskeggs@redhat.com>,
        Lyude Paul <lyude@redhat.com>, Daniel Vetter <daniel@ffwll.ch>,
        Gourav Samaiya <gsamaiya@nvidia.com>,
        "open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS" 
        <dri-devel@lists.freedesktop.org>,
        "open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS" 
        <nouveau@lists.freedesktop.org>
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On Tue, 23 May 2023 at 19:37, Karol Herbst <kherbst@redhat.com> wrote:
>
> On Mon, May 22, 2023 at 10:18=E2=80=AFPM Karol Herbst <kherbst@redhat.com=
> wrote:
> >
> > This fixes a NULL pointer access inside nvkm_acr_oneinit in case necess=
ary
> > firmware files couldn't be loaded.
> >
> > Closes: https://gitlab.freedesktop.org/drm/nouveau/-/issues/212
> > Fixes: 4b569ded09fd ("drm/nouveau/acr/ga102: initial support")
> > Signed-off-by: Karol Herbst <kherbst@redhat.com>
> > ---
> >  drivers/gpu/drm/nouveau/nvkm/subdev/acr/base.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/base.c b/drivers/g=
pu/drm/nouveau/nvkm/subdev/acr/base.c
> > index 795f3a649b12..6388234c352c 100644
> > --- a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/base.c
> > +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/base.c
> > @@ -224,7 +224,7 @@ nvkm_acr_oneinit(struct nvkm_subdev *subdev)
> >         u64 falcons;
> >         int ret, i;
> >
> > -       if (list_empty(&acr->hsfw)) {
> > +       if (list_empty(&acr->hsfw) || !acr->func->wpr_layout) {
>
> Now thinking about this, it should probably also check acr->func...

with that fixed if you think you need it,

Reviewed-by: Dave Airlie <airlied@redhat.com>

>
> >                 nvkm_debug(subdev, "No HSFW(s)\n");
> >                 nvkm_acr_cleanup(acr);
> >                 return 0;
> > --
> > 2.40.1
> >
>