[PATCH AUTOSEL 5.15 03/10] drm/amdgpu/pm: Fix the null pointer dereference in apply_state_adjust_rules

[Sasha Levin]

From: Ma Jun <Jun.Ma2@xxxxxxx>

[ Upstream commit d19fb10085a49b77578314f69fff21562f7cd054 ]

Check the pointer value to fix potential null pointer
dereference

Acked-by: Yang Wang<kevinyang.wang@xxxxxxx>
Signed-off-by: Ma Jun <Jun.Ma2@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 .../gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c    |  7 +++++--
 .../gpu/drm/amd/pm/powerplay/hwmgr/smu8_hwmgr.c    | 14 ++++++++------
 .../gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c  |  7 +++++--
 3 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c
index 2451cec031dda..9c7c3c06327d9 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c
@@ -3275,8 +3275,7 @@ static int smu7_apply_state_adjust_rules(struct pp_hwmgr *hwmgr,
 			const struct pp_power_state *current_ps)
 {
 	struct amdgpu_device *adev = hwmgr->adev;
-	struct smu7_power_state *smu7_ps =
-				cast_phw_smu7_power_state(&request_ps->hardware);
+	struct smu7_power_state *smu7_ps;
 	uint32_t sclk;
 	uint32_t mclk;
 	struct PP_Clocks minimum_clocks = {0};
@@ -3293,6 +3292,10 @@ static int smu7_apply_state_adjust_rules(struct pp_hwmgr *hwmgr,
 	uint32_t latency;
 	bool latency_allowed = false;
 
+	smu7_ps = cast_phw_smu7_power_state(&request_ps->hardware);
+	if (!smu7_ps)
+		return -EINVAL;
+
 	data->battery_state = (PP_StateUILabel_Battery ==
 			request_ps->classification.ui_label);
 	data->mclk_ignore_signal = false;
diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu8_hwmgr.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu8_hwmgr.c
index 03bf8f0692228..f0f8ebffd9f2f 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu8_hwmgr.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu8_hwmgr.c
@@ -1051,16 +1051,18 @@ static int smu8_apply_state_adjust_rules(struct pp_hwmgr *hwmgr,
 				struct pp_power_state  *prequest_ps,
 			const struct pp_power_state *pcurrent_ps)
 {
-	struct smu8_power_state *smu8_ps =
-				cast_smu8_power_state(&prequest_ps->hardware);
-
-	const struct smu8_power_state *smu8_current_ps =
-				cast_const_smu8_power_state(&pcurrent_ps->hardware);
-
+	struct smu8_power_state *smu8_ps;
+	const struct smu8_power_state *smu8_current_ps;
 	struct smu8_hwmgr *data = hwmgr->backend;
 	struct PP_Clocks clocks = {0, 0, 0, 0};
 	bool force_high;
 
+	smu8_ps = cast_smu8_power_state(&prequest_ps->hardware);
+	smu8_current_ps = cast_const_smu8_power_state(&pcurrent_ps->hardware);
+
+	if (!smu8_ps || !smu8_current_ps)
+		return -EINVAL;
+
 	smu8_ps->need_dfs_bypass = true;
 
 	data->battery_state = (PP_StateUILabel_Battery == prequest_ps->classification.ui_label);
diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c
index e6336654c5655..aba8904ac75f7 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c
@@ -3237,8 +3237,7 @@ static int vega10_apply_state_adjust_rules(struct pp_hwmgr *hwmgr,
 			const struct pp_power_state *current_ps)
 {
 	struct amdgpu_device *adev = hwmgr->adev;
-	struct vega10_power_state *vega10_ps =
-				cast_phw_vega10_power_state(&request_ps->hardware);
+	struct vega10_power_state *vega10_ps;
 	uint32_t sclk;
 	uint32_t mclk;
 	struct PP_Clocks minimum_clocks = {0};
@@ -3256,6 +3255,10 @@ static int vega10_apply_state_adjust_rules(struct pp_hwmgr *hwmgr,
 	uint32_t stable_pstate_sclk = 0, stable_pstate_mclk = 0;
 	uint32_t latency;
 
+	vega10_ps = cast_phw_vega10_power_state(&request_ps->hardware);
+	if (!vega10_ps)
+		return -EINVAL;
+
 	data->battery_state = (PP_StateUILabel_Battery ==
 			request_ps->classification.ui_label);
 
-- 
2.43.0