[PATCH] drm/amdgpu: Move null pointer dereference check

[PATCH] drm/amdgpu: Move null pointer dereference check

[Austin Kim]

Null pointer dereference check should have been checked,
ahead of below routine.
	struct amdgpu_device *adev = hwmgr->adev;

With this commit, it could avoid potential NULL dereference.

Signed-off-by: Austin Kim <austindh.kim@gmail.com>
---
 drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c b/drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c
index 8189fe4..4728aa2 100644
--- a/drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c
+++ b/drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c
@@ -722,16 +722,17 @@ static int smu8_request_smu_load_fw(struct pp_hwmgr *hwmgr)
 
 static int smu8_start_smu(struct pp_hwmgr *hwmgr)
 {
-	struct amdgpu_device *adev = hwmgr->adev;
+	struct amdgpu_device *adev;
 
 	uint32_t index = SMN_MP1_SRAM_START_ADDR +
 			 SMU8_FIRMWARE_HEADER_LOCATION +
 			 offsetof(struct SMU8_Firmware_Header, Version);
 
-
 	if (hwmgr == NULL || hwmgr->device == NULL)
 		return -EINVAL;
 
+	adev = hwmgr->adev;
+
 	cgs_write_register(hwmgr->device, mmMP0PUB_IND_INDEX, index);
 	hwmgr->smu_version = cgs_read_register(hwmgr->device, mmMP0PUB_IND_DATA);
 	pr_info("smu version %02d.%02d.%02d\n",
-- 
2.6.2

Re: [PATCH] drm/amdgpu: Move null pointer dereference check

[Alex Deucher]

On Fri, Aug 30, 2019 at 8:43 AM Austin Kim <austindh.kim@gmail.com> wrote:
>
> Null pointer dereference check should have been checked,
> ahead of below routine.
>         struct amdgpu_device *adev = hwmgr->adev;
>
> With this commit, it could avoid potential NULL dereference.
>
> Signed-off-by: Austin Kim <austindh.kim@gmail.com>

Applied.  thanks!

Alex

> ---
>  drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c b/drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c
> index 8189fe4..4728aa2 100644
> --- a/drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c
> +++ b/drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c
> @@ -722,16 +722,17 @@ static int smu8_request_smu_load_fw(struct pp_hwmgr *hwmgr)
>
>  static int smu8_start_smu(struct pp_hwmgr *hwmgr)
>  {
> -       struct amdgpu_device *adev = hwmgr->adev;
> +       struct amdgpu_device *adev;
>
>         uint32_t index = SMN_MP1_SRAM_START_ADDR +
>                          SMU8_FIRMWARE_HEADER_LOCATION +
>                          offsetof(struct SMU8_Firmware_Header, Version);
>
> -
>         if (hwmgr == NULL || hwmgr->device == NULL)
>                 return -EINVAL;
>
> +       adev = hwmgr->adev;
> +
>         cgs_write_register(hwmgr->device, mmMP0PUB_IND_INDEX, index);
>         hwmgr->smu_version = cgs_read_register(hwmgr->device, mmMP0PUB_IND_DATA);
>         pr_info("smu version %02d.%02d.%02d\n",
> --
> 2.6.2
>
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