linux-kernel - Re: [PATCH] drm/nouveau/acr: Abort loading ACR if no firmware was found

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Message-ID: <CACO55tuZeJZ6GTA+ooaXsSgde2Zy70qpe8Cg_AEfZRXtmd2LWA@mail.gmail.com>
Date:   Tue, 23 May 2023 11:37:13 +0200
From:   Karol Herbst <kherbst@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Ben Skeggs <bskeggs@...hat.com>, Lyude Paul <lyude@...hat.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Gourav Samaiya <gsamaiya@...dia.com>,
        "open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS" 
        <dri-devel@...ts.freedesktop.org>,
        "open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS" 
        <nouveau@...ts.freedesktop.org>
Subject: Re: [PATCH] drm/nouveau/acr: Abort loading ACR if no firmware was found

On Mon, May 22, 2023 at 10:18 PM Karol Herbst <kherbst@...hat.com> wrote:
>
> This fixes a NULL pointer access inside nvkm_acr_oneinit in case necessary
> 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@...hat.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/gpu/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...

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