Nouveau - May 2023 - [PATCH] drm/nouveau/acr: Abort loading ACR if no firmware was found

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

On Mon, May 22, 2023 at 10:18?PM Karol Herbst <kherbst at redhat.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 at 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/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
>