2021-11-18 11:16:26

by Dan Carpenter

Subject: [PATCH] drm/nouveau/acr: fix a couple NULL vs IS_ERR() checks

The nvkm_acr_lsfw_add() function never returns NULL. It returns error
pointers on error.

Fixes: 22dcda45a3d1 ("drm/nouveau/acr: implement new subdev to replace "secure boot"")
Signed-off-by: Dan Carpenter <[email protected]>
---
drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c | 6 ++++--
drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c | 6 ++++--
2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c
index cdb1ead26d84..82b4c8e1457c 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c
@@ -207,11 +207,13 @@ int
gm200_acr_wpr_parse(struct nvkm_acr *acr)
{
const struct wpr_header *hdr = (void *)acr->wpr_fw->data;
+ struct nvkm_acr_lsfw *lsfw;

while (hdr->falcon_id != WPR_HEADER_V0_FALCON_ID_INVALID) {
wpr_header_dump(&acr->subdev, hdr);
- if (!nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)->falcon_id))
- return -ENOMEM;
+ lsfw = nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)->falcon_id);
+ if (IS_ERR(lsfw))
+ return PTR_ERR(lsfw);
}

return 0;
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c
index fb9132a39bb1..fd97a935a380 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c
@@ -161,11 +161,13 @@ int
gp102_acr_wpr_parse(struct nvkm_acr *acr)
{
const struct wpr_header_v1 *hdr = (void *)acr->wpr_fw->data;
+ struct nvkm_acr_lsfw *lsfw;

while (hdr->falcon_id != WPR_HEADER_V1_FALCON_ID_INVALID) {
wpr_header_v1_dump(&acr->subdev, hdr);
- if (!nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)->falcon_id))
- return -ENOMEM;
+ lsfw = nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)->falcon_id);
+ if (IS_ERR(lsfw))
+ return PTR_ERR(lsfw);
}

return 0;
--
2.20.1

2021-11-18 22:45:57

by Ben Skeggs

Subject: Re: [Nouveau] [PATCH] drm/nouveau/acr: fix a couple NULL vs IS_ERR() checks

On Thu, 18 Nov 2021 at 21:13, Dan Carpenter <[email protected]> wrote:
>
> The nvkm_acr_lsfw_add() function never returns NULL. It returns error
> pointers on error.
>
> Fixes: 22dcda45a3d1 ("drm/nouveau/acr: implement new subdev to replace "secure boot"")
> Signed-off-by: Dan Carpenter <[email protected]>
Reviewed-by: Ben Skeggs <[email protected]>

> ---
> drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c | 6 ++++--
> drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c | 6 ++++--
> 2 files changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c
> index cdb1ead26d84..82b4c8e1457c 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c
> @@ -207,11 +207,13 @@ int
> gm200_acr_wpr_parse(struct nvkm_acr *acr)
> {
> const struct wpr_header *hdr = (void *)acr->wpr_fw->data;
> + struct nvkm_acr_lsfw *lsfw;
>
> while (hdr->falcon_id != WPR_HEADER_V0_FALCON_ID_INVALID) {
> wpr_header_dump(&acr->subdev, hdr);
> - if (!nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)->falcon_id))
> - return -ENOMEM;
> + lsfw = nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)->falcon_id);
> + if (IS_ERR(lsfw))
> + return PTR_ERR(lsfw);
> }
>
> return 0;
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c
> index fb9132a39bb1..fd97a935a380 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c
> @@ -161,11 +161,13 @@ int
> gp102_acr_wpr_parse(struct nvkm_acr *acr)
> {
> const struct wpr_header_v1 *hdr = (void *)acr->wpr_fw->data;
> + struct nvkm_acr_lsfw *lsfw;
>
> while (hdr->falcon_id != WPR_HEADER_V1_FALCON_ID_INVALID) {
> wpr_header_v1_dump(&acr->subdev, hdr);
> - if (!nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)->falcon_id))
> - return -ENOMEM;
> + lsfw = nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)->falcon_id);
> + if (IS_ERR(lsfw))
> + return PTR_ERR(lsfw);
> }
>
> return 0;
> --
> 2.20.1
>

2021-11-23 19:36:15

by Lyude Paul

Subject: Re: [PATCH] drm/nouveau/acr: fix a couple NULL vs IS_ERR() checks

Reviewed-by: Lyude Paul <[email protected]>

Will push this to drm-misc in a bit

On Thu, 2021-11-18 at 14:13 +0300, Dan Carpenter wrote:
> The nvkm_acr_lsfw_add() function never returns NULL.  It returns error
> pointers on error.
>
> Fixes: 22dcda45a3d1 ("drm/nouveau/acr: implement new subdev to replace
> "secure boot"")
> Signed-off-by: Dan Carpenter <[email protected]>
> ---
>  drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c | 6 ++++--
>  drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c | 6 ++++--
>  2 files changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c
> b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c
> index cdb1ead26d84..82b4c8e1457c 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c
> @@ -207,11 +207,13 @@ int
>  gm200_acr_wpr_parse(struct nvkm_acr *acr)
>  {
>         const struct wpr_header *hdr = (void *)acr->wpr_fw->data;
> +       struct nvkm_acr_lsfw *lsfw;
>  
>         while (hdr->falcon_id != WPR_HEADER_V0_FALCON_ID_INVALID) {
>                 wpr_header_dump(&acr->subdev, hdr);
> -               if (!nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)->falcon_id))
> -                       return -ENOMEM;
> +               lsfw = nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)-
> >falcon_id);
> +               if (IS_ERR(lsfw))
> +                       return PTR_ERR(lsfw);
>         }
>  
>         return 0;
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c
> b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c
> index fb9132a39bb1..fd97a935a380 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c
> @@ -161,11 +161,13 @@ int
>  gp102_acr_wpr_parse(struct nvkm_acr *acr)
>  {
>         const struct wpr_header_v1 *hdr = (void *)acr->wpr_fw->data;
> +       struct nvkm_acr_lsfw *lsfw;
>  
>         while (hdr->falcon_id != WPR_HEADER_V1_FALCON_ID_INVALID) {
>                 wpr_header_v1_dump(&acr->subdev, hdr);
> -               if (!nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)->falcon_id))
> -                       return -ENOMEM;
> +               lsfw = nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)-
> >falcon_id);
> +               if (IS_ERR(lsfw))
> +                       return PTR_ERR(lsfw);
>         }
>  
>         return 0;

--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat