Fix crash if trying to erase the FRP data.

- Once factory reset protection is on, user data shall not be erased.

Flag: EXEMPT bug fix
Fix: 345587437
Test: Manual test passed
Test: atest passed
Change-Id: I9506224cae7ba12c4181f2b2c676e5eb8ec27431

src/com/android/settings/MainClearConfirm.java

@@ -89,8 +89,7 @@ public class MainClearConfirm extends InstrumentedFragment {
             final PersistentDataBlockManager pdbManager;
             // pre-flight check hardware support PersistentDataBlockManager
             if (!SystemProperties.get(PERSISTENT_DATA_BLOCK_PROP).equals("")) {
-                pdbManager = (PersistentDataBlockManager)
-                    getActivity().getSystemService(Context.PERSISTENT_DATA_BLOCK_SERVICE);
+                pdbManager = getActivity().getSystemService(PersistentDataBlockManager.class);
             } else {
                 pdbManager = null;
             }
@@ -152,6 +151,11 @@ public class MainClearConfirm extends InstrumentedFragment {
             return false;
         }
 
+        // Do not try to erase factory reset protection data if the protection is alive.
+        if (pdbManager.isFactoryResetProtectionActive()) {
+            return false;
+        }
+
         // The persistent data block will persist if the device is still being provisioned.
         if (isDeviceStillBeingProvisioned()) {
             return false;

tests/robotests/src/com/android/settings/MainClearConfirmTest.java

@@ -77,6 +77,7 @@ public class MainClearConfirmTest {
 
         when(mMockActivity.getSystemService(Context.DEVICE_POLICY_SERVICE))
                 .thenReturn(mDevicePolicyManager);
+        when(mPersistentDataBlockManager.isFactoryResetProtectionActive()).thenReturn(false);
     }
 
     @Test
@@ -112,6 +113,13 @@ public class MainClearConfirmTest {
         assertThat(mMainClearConfirm.shouldWipePersistentDataBlock(null)).isFalse();
     }
 
+    @Test
+    public void shouldWipePersistentDataBlock_frpIsAlive_shouldReturnFalse() {
+        when(mPersistentDataBlockManager.isFactoryResetProtectionActive()).thenReturn(true);
+        assertThat(mMainClearConfirm.shouldWipePersistentDataBlock(mPersistentDataBlockManager))
+                .isFalse();
+    }
+
     @Test
     public void shouldWipePersistentDataBlock_deviceIsStillBeingProvisioned_shouldReturnFalse() {
         doReturn(true).when(mMainClearConfirm).isDeviceStillBeingProvisioned();