Nouveau - Jan 2020 - [PATCH] nouveau/secboot/gm20b: initialize pointer in gm20b_secboot_new()

We accidentally set "psb" which is a no-op instead of "*psb"
so it
generates a static checker warning.  We should probably set it before
the first error return so that it's always initialized.

Fixes: 923f1bd27bf1 ("drm/nouveau/secboot/gm20b: add secure boot
support")
Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
---
Static analysis.  I'm not sure how this is called.

 drivers/gpu/drm/nouveau/nvkm/subdev/secboot/gm20b.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/secboot/gm20b.c
b/drivers/gpu/drm/nouveau/nvkm/subdev/secboot/gm20b.c
index df8b919dcf09..ace6fefba428 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/secboot/gm20b.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/secboot/gm20b.c
@@ -108,6 +108,7 @@ gm20b_secboot_new(struct nvkm_device *device, int index,
 	struct gm200_secboot *gsb;
 	struct nvkm_acr *acr;
 
+	*psb = NULL;
 	acr = acr_r352_new(BIT(NVKM_SECBOOT_FALCON_FECS) |
 			   BIT(NVKM_SECBOOT_FALCON_PMU));
 	if (IS_ERR(acr))
@@ -116,10 +117,8 @@ gm20b_secboot_new(struct nvkm_device *device, int index,
 	acr->optional_falcons = BIT(NVKM_SECBOOT_FALCON_PMU);
 
 	gsb = kzalloc(sizeof(*gsb), GFP_KERNEL);
-	if (!gsb) {
-		psb = NULL;
+	if (!gsb)
 		return -ENOMEM;
-	}
 	*psb = &gsb->base;
 
 	ret = nvkm_secboot_ctor(&gm20b_secboot, acr, device, index,
&gsb->base);
-- 
2.11.0

On Wed, 8 Jan 2020 at 15:46, Dan Carpenter <dan.carpenter at oracle.com>
wrote:
>
> We accidentally set "psb" which is a no-op instead of
"*psb" so it
> generates a static checker warning.  We should probably set it before
> the first error return so that it's always initialized.
You actually don't need to do either, *psb will be NULL already on
entry to the function.  But removing the assignment in the error path
should be done still.

Ben.
>
> Fixes: 923f1bd27bf1 ("drm/nouveau/secboot/gm20b: add secure boot
support")
> Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
> ---
> Static analysis.  I'm not sure how this is called.
>
>  drivers/gpu/drm/nouveau/nvkm/subdev/secboot/gm20b.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/secboot/gm20b.c
b/drivers/gpu/drm/nouveau/nvkm/subdev/secboot/gm20b.c
> index df8b919dcf09..ace6fefba428 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/secboot/gm20b.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/secboot/gm20b.c
> @@ -108,6 +108,7 @@ gm20b_secboot_new(struct nvkm_device *device, int
index,
>         struct gm200_secboot *gsb;
>         struct nvkm_acr *acr;
>
> +       *psb = NULL;
>         acr = acr_r352_new(BIT(NVKM_SECBOOT_FALCON_FECS) |
>                            BIT(NVKM_SECBOOT_FALCON_PMU));
>         if (IS_ERR(acr))
> @@ -116,10 +117,8 @@ gm20b_secboot_new(struct nvkm_device *device, int
index,
>         acr->optional_falcons = BIT(NVKM_SECBOOT_FALCON_PMU);
>
>         gsb = kzalloc(sizeof(*gsb), GFP_KERNEL);
> -       if (!gsb) {
> -               psb = NULL;
> +       if (!gsb)
>                 return -ENOMEM;
> -       }
>         *psb = &gsb->base;
>
>         ret = nvkm_secboot_ctor(&gm20b_secboot, acr, device, index,
&gsb->base);
> --
> 2.11.0
>
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