[lvc-project] [PATCH 5.10/5.15] drm/amd/pm: vega10_hwmgr: fix potential off-by-one overflow in 'performance_levels'

[Igor Artemiev]

From: Alexey Kodanev <aleksei.kodanev at bell-sw.com>

commit 2cc4a5914ce952d6fc83b0f8089a23095ad4f677 upstream.

Since 'hardwareActivityPerformanceLevels' is set to the size of the
'performance_levels' array in vega10_hwmgr_backend_init(), using the
'<=' assertion to check for the next index value is incorrect.
Replace it with '<'.

Detected using the static analysis tool - Svace.
Fixes: f83a9991648b ("drm/amd/powerplay: add Vega10 powerplay support (v5)")
Reviewed-by: Evan Quan <evan.quan at amd.com>
Signed-off-by: Alexey Kodanev <aleksei.kodanev at bell-sw.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
[Igor: In order to adapt this patch to branch 5.10/5.15 the variable name
'vega10_ps' has been changed to 'vega10_power_state' as it is used 
in branch 5.10/5.15.] 
Signed-off-by: Igor Artemiev <Igor.A.Artemiev at mcst.ru>
---
 drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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 79a41180adf1..30eab5002077 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c
@@ -3171,7 +3171,7 @@ static int vega10_get_pp_table_entry_callback_func(struct pp_hwmgr *hwmgr,
 			return -1);
 
 	PP_ASSERT_WITH_CODE(
-			(vega10_power_state->performance_level_count <=
+			(vega10_power_state->performance_level_count <
 					hwmgr->platform_descriptor.
 					hardwareActivityPerformanceLevels),
 			"Performance levels exceeds Driver limit!",
-- 
2.39.2