drm/amd/pm: fix a double-free in amdgpu_parse_extended_power_table

The amdgpu_free_extended_power_table is called in every error-handling
paths of amdgpu_parse_extended_power_table. However, after the following
call chain of returning:

amdgpu_parse_extended_power_table
  |-> kv_dpm_init / si_dpm_init
      (the only two caller of amdgpu_parse_extended_power_table)
        |-> kv_dpm_sw_init / si_dpm_sw_init
            (the only caller of kv_dpm_init / si_dpm_init, accordingly)
              |-> kv_dpm_fini / si_dpm_fini
                  (goto dpm_failed in xx_dpm_sw_init)
                    |-> amdgpu_free_extended_power_table

As above, the amdgpu_free_extended_power_table is called twice in this
returning chain and thus a double-free is triggered. Similarily, the
last kfree in amdgpu_parse_extended_power_table also cause a double free
with amdgpu_free_extended_power_table in kv_dpm_fini.

Fixes: 84176663 ("drm/amd/pm: create a new holder for those APIs used only by legacy ASICs(si/kv)")
Signed-off-by: Zhipeng Lu <alexious@zju.edu.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/legacy-dpm/legacy_dpm.c

@@ -272,10 +272,8 @@ int amdgpu_parse_extended_power_table(struct amdgpu_device *adev)
 				 le16_to_cpu(power_info->pplib4.usVddcDependencyOnSCLKOffset));
 			ret = amdgpu_parse_clk_voltage_dep_table(&adev->pm.dpm.dyn_state.vddc_dependency_on_sclk,
 								 dep_table);
-			if (ret) {
-				amdgpu_free_extended_power_table(adev);
+			if (ret)
 				return ret;
-			}
 		}
 		if (power_info->pplib4.usVddciDependencyOnMCLKOffset) {
 			dep_table = (ATOM_PPLIB_Clock_Voltage_Dependency_Table *)
@@ -283,10 +281,8 @@ int amdgpu_parse_extended_power_table(struct amdgpu_device *adev)
 				 le16_to_cpu(power_info->pplib4.usVddciDependencyOnMCLKOffset));
 			ret = amdgpu_parse_clk_voltage_dep_table(&adev->pm.dpm.dyn_state.vddci_dependency_on_mclk,
 								 dep_table);
-			if (ret) {
-				amdgpu_free_extended_power_table(adev);
+			if (ret)
 				return ret;
-			}
 		}
 		if (power_info->pplib4.usVddcDependencyOnMCLKOffset) {
 			dep_table = (ATOM_PPLIB_Clock_Voltage_Dependency_Table *)
@@ -294,10 +290,8 @@ int amdgpu_parse_extended_power_table(struct amdgpu_device *adev)
 				 le16_to_cpu(power_info->pplib4.usVddcDependencyOnMCLKOffset));
 			ret = amdgpu_parse_clk_voltage_dep_table(&adev->pm.dpm.dyn_state.vddc_dependency_on_mclk,
 								 dep_table);
-			if (ret) {
-				amdgpu_free_extended_power_table(adev);
+			if (ret)
 				return ret;
-			}
 		}
 		if (power_info->pplib4.usMvddDependencyOnMCLKOffset) {
 			dep_table = (ATOM_PPLIB_Clock_Voltage_Dependency_Table *)
@@ -305,10 +299,8 @@ int amdgpu_parse_extended_power_table(struct amdgpu_device *adev)
 				 le16_to_cpu(power_info->pplib4.usMvddDependencyOnMCLKOffset));
 			ret = amdgpu_parse_clk_voltage_dep_table(&adev->pm.dpm.dyn_state.mvdd_dependency_on_mclk,
 								 dep_table);
-			if (ret) {
-				amdgpu_free_extended_power_table(adev);
+			if (ret)
 				return ret;
-			}
 		}
 		if (power_info->pplib4.usMaxClockVoltageOnDCOffset) {
 			ATOM_PPLIB_Clock_Voltage_Limit_Table *clk_v =
@@ -339,10 +331,8 @@ int amdgpu_parse_extended_power_table(struct amdgpu_device *adev)
 				kcalloc(psl->ucNumEntries,
 					sizeof(struct amdgpu_phase_shedding_limits_entry),
 					GFP_KERNEL);
-			if (!adev->pm.dpm.dyn_state.phase_shedding_limits_table.entries) {
-				amdgpu_free_extended_power_table(adev);
+			if (!adev->pm.dpm.dyn_state.phase_shedding_limits_table.entries)
 				return -ENOMEM;
-			}
 
 			entry = &psl->entries[0];
 			for (i = 0; i < psl->ucNumEntries; i++) {
@@ -383,10 +373,8 @@ int amdgpu_parse_extended_power_table(struct amdgpu_device *adev)
 			ATOM_PPLIB_CAC_Leakage_Record *entry;
 			u32 size = cac_table->ucNumEntries * sizeof(struct amdgpu_cac_leakage_table);
 			adev->pm.dpm.dyn_state.cac_leakage_table.entries = kzalloc(size, GFP_KERNEL);
-			if (!adev->pm.dpm.dyn_state.cac_leakage_table.entries) {
-				amdgpu_free_extended_power_table(adev);
+			if (!adev->pm.dpm.dyn_state.cac_leakage_table.entries)
 				return -ENOMEM;
-			}
 			entry = &cac_table->entries[0];
 			for (i = 0; i < cac_table->ucNumEntries; i++) {
 				if (adev->pm.dpm.platform_caps & ATOM_PP_PLATFORM_CAP_EVV) {
@@ -438,10 +426,8 @@ int amdgpu_parse_extended_power_table(struct amdgpu_device *adev)
 				sizeof(struct amdgpu_vce_clock_voltage_dependency_entry);
 			adev->pm.dpm.dyn_state.vce_clock_voltage_dependency_table.entries =
 				kzalloc(size, GFP_KERNEL);
-			if (!adev->pm.dpm.dyn_state.vce_clock_voltage_dependency_table.entries) {
-				amdgpu_free_extended_power_table(adev);
+			if (!adev->pm.dpm.dyn_state.vce_clock_voltage_dependency_table.entries)
 				return -ENOMEM;
-			}
 			adev->pm.dpm.dyn_state.vce_clock_voltage_dependency_table.count =
 				limits->numEntries;
 			entry = &limits->entries[0];
@@ -493,10 +479,8 @@ int amdgpu_parse_extended_power_table(struct amdgpu_device *adev)
 				sizeof(struct amdgpu_uvd_clock_voltage_dependency_entry);
 			adev->pm.dpm.dyn_state.uvd_clock_voltage_dependency_table.entries =
 				kzalloc(size, GFP_KERNEL);
-			if (!adev->pm.dpm.dyn_state.uvd_clock_voltage_dependency_table.entries) {
-				amdgpu_free_extended_power_table(adev);
+			if (!adev->pm.dpm.dyn_state.uvd_clock_voltage_dependency_table.entries)
 				return -ENOMEM;
-			}
 			adev->pm.dpm.dyn_state.uvd_clock_voltage_dependency_table.count =
 				limits->numEntries;
 			entry = &limits->entries[0];
@@ -525,10 +509,8 @@ int amdgpu_parse_extended_power_table(struct amdgpu_device *adev)
 				sizeof(struct amdgpu_clock_voltage_dependency_entry);
 			adev->pm.dpm.dyn_state.samu_clock_voltage_dependency_table.entries =
 				kzalloc(size, GFP_KERNEL);
-			if (!adev->pm.dpm.dyn_state.samu_clock_voltage_dependency_table.entries) {
-				amdgpu_free_extended_power_table(adev);
+			if (!adev->pm.dpm.dyn_state.samu_clock_voltage_dependency_table.entries)
 				return -ENOMEM;
-			}
 			adev->pm.dpm.dyn_state.samu_clock_voltage_dependency_table.count =
 				limits->numEntries;
 			entry = &limits->entries[0];
@@ -548,10 +530,8 @@ int amdgpu_parse_extended_power_table(struct amdgpu_device *adev)
 				 le16_to_cpu(ext_hdr->usPPMTableOffset));
 			adev->pm.dpm.dyn_state.ppm_table =
 				kzalloc(sizeof(struct amdgpu_ppm_table), GFP_KERNEL);
-			if (!adev->pm.dpm.dyn_state.ppm_table) {
-				amdgpu_free_extended_power_table(adev);
+			if (!adev->pm.dpm.dyn_state.ppm_table)
 				return -ENOMEM;
-			}
 			adev->pm.dpm.dyn_state.ppm_table->ppm_design = ppm->ucPpmDesign;
 			adev->pm.dpm.dyn_state.ppm_table->cpu_core_number =
 				le16_to_cpu(ppm->usCpuCoreNumber);
@@ -583,10 +563,8 @@ int amdgpu_parse_extended_power_table(struct amdgpu_device *adev)
 				sizeof(struct amdgpu_clock_voltage_dependency_entry);
 			adev->pm.dpm.dyn_state.acp_clock_voltage_dependency_table.entries =
 				kzalloc(size, GFP_KERNEL);
-			if (!adev->pm.dpm.dyn_state.acp_clock_voltage_dependency_table.entries) {
-				amdgpu_free_extended_power_table(adev);
+			if (!adev->pm.dpm.dyn_state.acp_clock_voltage_dependency_table.entries)
 				return -ENOMEM;
-			}
 			adev->pm.dpm.dyn_state.acp_clock_voltage_dependency_table.count =
 				limits->numEntries;
 			entry = &limits->entries[0];
@@ -606,10 +584,8 @@ int amdgpu_parse_extended_power_table(struct amdgpu_device *adev)
 			ATOM_PowerTune_Table *pt;
 			adev->pm.dpm.dyn_state.cac_tdp_table =
 				kzalloc(sizeof(struct amdgpu_cac_tdp_table), GFP_KERNEL);
-			if (!adev->pm.dpm.dyn_state.cac_tdp_table) {
-				amdgpu_free_extended_power_table(adev);
+			if (!adev->pm.dpm.dyn_state.cac_tdp_table)
 				return -ENOMEM;
-			}
 			if (rev > 0) {
 				ATOM_PPLIB_POWERTUNE_Table_V1 *ppt = (ATOM_PPLIB_POWERTUNE_Table_V1 *)
 					(mode_info->atom_context->bios + data_offset +
@@ -645,10 +621,8 @@ int amdgpu_parse_extended_power_table(struct amdgpu_device *adev)
 			ret = amdgpu_parse_clk_voltage_dep_table(
 					&adev->pm.dpm.dyn_state.vddgfx_dependency_on_sclk,
 					dep_table);
-			if (ret) {
-				kfree(adev->pm.dpm.dyn_state.vddgfx_dependency_on_sclk.entries);
+			if (ret)
 				return ret;
-			}
 		}
 	}