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Subject[PATCH] drm/amd/powerplay: Variable ps could be NULL when it get dereferenced
Date
Inside function cz_get_performance_level(), pointer ps could be NULL via
cast_const_PhwCzPowerState(). However, this pointer is dereferenced
without any check, which is potentially unsafe.

Signed-off-by: Yizhuo <yzhai003@ucr.edu>
---
drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c
index bc839ff0bdd0..d2628e7b612d 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c
@@ -1799,6 +1799,9 @@ static int cz_get_performance_level(struct pp_hwmgr *hwmgr, const struct pp_hw_p
data = (struct cz_hwmgr *)(hwmgr->backend);
ps = cast_const_PhwCzPowerState(state);

+ if (!ps)
+ return -EINVAL;
+
level_index = index > ps->level - 1 ? ps->level - 1 : index;
level->coreClock = ps->levels[level_index].engineClock;

--
2.17.1
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