[PATCH v5.15-v5.10] drm/amd/pm: Fix the null pointer dereference for vega10_hwmgr

sikkamukul
2024-09-03T04:58:52Z

From: Bob Zhou <bob.zhou@amd.com>

[ Upstream commit 50151b7f1c79a09117837eb95b76c2de76841dab ]

Check return value and conduct null pointer handling to avoid null pointer dereference.

Signed-off-by: Bob Zhou <bob.zhou@amd.com>
Reviewed-by: Tim Huang <Tim.Huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Mukul Sikka <mukul.sikka@broadcom.com>
---
.../drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c | 30 ++++++++++++++++---
1 file changed, 26 insertions(+), 4 deletions(-)

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 10678b519..304874cba 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c
@@ -3391,13 +3391,17 @@ static int vega10_find_dpm_states_clocks_in_dpm_table(struct pp_hwmgr *hwmgr, co
const struct vega10_power_state *vega10_ps =
cast_const_phw_vega10_power_state(states->pnew_state);
struct vega10_single_dpm_table *sclk_table = &(data->dpm_table.gfx_table);
- uint32_t sclk = vega10_ps->performance_levels
- [vega10_ps->performance_level_count - 1].gfx_clock;
struct vega10_single_dpm_table *mclk_table = &(data->dpm_table.mem_table);
- uint32_t mclk = vega10_ps->performance_levels
- [vega10_ps->performance_level_count - 1].mem_clock;
+ uint32_t sclk, mclk;
uint32_t i;

+ if (vega10_ps == NULL)
+ return -EINVAL;
+ sclk = vega10_ps->performance_levels
+ [vega10_ps->performance_level_count - 1].gfx_clock;
+ mclk = vega10_ps->performance_levels
+ [vega10_ps->performance_level_count - 1].mem_clock;
+
for (i = 0; i < sclk_table->count; i++) {
if (sclk == sclk_table->dpm_levels[i].value)
break;
@@ -3704,6 +3708,9 @@ static int vega10_generate_dpm_level_enable_mask(
cast_const_phw_vega10_power_state(states->pnew_state);
int i;

+ if (vega10_ps == NULL)
+ return -EINVAL;
+
PP_ASSERT_WITH_CODE(!vega10_trim_dpm_states(hwmgr, vega10_ps),
"Attempt to Trim DPM States Failed!",
return -1);
@@ -4828,6 +4835,9 @@ static int vega10_check_states_equal(struct pp_hwmgr *hwmgr,

psa = cast_const_phw_vega10_power_state(pstate1);
psb = cast_const_phw_vega10_power_state(pstate2);
+ if (psa == NULL || psb == NULL)
+ return -EINVAL;
+
/* If the two states don't even have the same number of performance levels they cannot be the same state. */
if (psa->performance_level_count != psb->performance_level_count) {
*equal = false;
@@ -4953,6 +4963,8 @@ static int vega10_set_sclk_od(struct pp_hwmgr *hwmgr, uint32_t value)
return -EINVAL;

vega10_ps = cast_phw_vega10_power_state(&ps->hardware);
+ if (vega10_ps == NULL)
+ return -EINVAL;

vega10_ps->performance_levels
[vega10_ps->performance_level_count - 1].gfx_clock =
@@ -5004,6 +5016,8 @@ static int vega10_set_mclk_od(struct pp_hwmgr *hwmgr, uint32_t value)
return -EINVAL;

vega10_ps = cast_phw_vega10_power_state(&ps->hardware);
+ if (vega10_ps == NULL)
+ return -EINVAL;

vega10_ps->performance_levels
[vega10_ps->performance_level_count - 1].mem_clock =
@@ -5239,6 +5253,9 @@ static void vega10_odn_update_power_state(struct pp_hwmgr *hwmgr)
return;

vega10_ps = cast_phw_vega10_power_state(&ps->hardware);
+ if (vega10_ps == NULL)
+ return;
+
max_level = vega10_ps->performance_level_count - 1;

if (vega10_ps->performance_levels[max_level].gfx_clock !=
@@ -5261,6 +5278,9 @@ static void vega10_odn_update_power_state(struct pp_hwmgr *hwmgr)

ps = (struct pp_power_state *)((unsigned long)(hwmgr->ps) + hwmgr->ps_size * (hwmgr->num_ps - 1));
vega10_ps = cast_phw_vega10_power_state(&ps->hardware);
+ if (vega10_ps == NULL)
+ return;
+
max_level = vega10_ps->performance_level_count - 1;

if (vega10_ps->performance_levels[max_level].gfx_clock !=
@@ -5451,6 +5471,8 @@ static int vega10_get_performance_level(struct pp_hwmgr *hwmgr, const struct pp_
return -EINVAL;

ps = cast_const_phw_vega10_power_state(state);
+ if (ps == NULL)
+ return -EINVAL;

i = index > ps->performance_level_count - 1 ?
ps->performance_level_count - 1 : index;
--
2.39.4