5.10-stable review patch. If anyone has any objections, please let me know.
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From: Bob Zhou bob.zhou@amd.com
commit 50151b7f1c79a09117837eb95b76c2de76841dab upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c | 30 +++++++++++++++--- 1 file changed, 26 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_hwmgr.c @@ -3410,13 +3410,17 @@ static int vega10_find_dpm_states_clocks 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; @@ -3723,6 +3727,9 @@ static int vega10_generate_dpm_level_ena 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); @@ -4858,6 +4865,9 @@ static int vega10_check_states_equal(str
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; @@ -4983,6 +4993,8 @@ static int vega10_set_sclk_od(struct pp_ 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 = @@ -5034,6 +5046,8 @@ static int vega10_set_mclk_od(struct pp_ 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 = @@ -5269,6 +5283,9 @@ static void vega10_odn_update_power_stat 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 != @@ -5291,6 +5308,9 @@ static void vega10_odn_update_power_stat
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 != @@ -5481,6 +5501,8 @@ static int vega10_get_performance_level( 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;