Fix vulnerability in LockSettings service

Fixes bug 30003944

Change-Id: I8700d4424c6186c8d5e71d2fdede0223ad86904d

core/java/com/android/internal/widget/LockPatternUtils.java

@@ -287,7 +287,7 @@ public class LockPatternUtils {
                 return false;
             }
         } catch (RemoteException re) {
-            return true;
+            return false;
         }
     }
 
@@ -336,7 +336,7 @@ public class LockPatternUtils {
                 return false;
             }
         } catch (RemoteException re) {
-            return true;
+            return false;
         }
     }
 

services/core/java/com/android/server/LockSettingsService.java

@@ -512,6 +512,9 @@ public class LockSettingsService extends ILockSettings.Stub {
     private VerifyCredentialResponse doVerifyPattern(String pattern, boolean hasChallenge,
             long challenge, int userId) throws RemoteException {
        checkPasswordReadPermission(userId);
+       if (TextUtils.isEmpty(pattern)) {
+           throw new IllegalArgumentException("Pattern can't be null or empty");
+       }
        CredentialHash storedHash = mStorage.readPatternHash(userId);
        boolean shouldReEnrollBaseZero = storedHash != null && storedHash.isBaseZeroPattern;
 
@@ -568,6 +571,9 @@ public class LockSettingsService extends ILockSettings.Stub {
     private VerifyCredentialResponse doVerifyPassword(String password, boolean hasChallenge,
             long challenge, int userId) throws RemoteException {
        checkPasswordReadPermission(userId);
+       if (TextUtils.isEmpty(password)) {
+           throw new IllegalArgumentException("Password can't be null or empty");
+       }
        CredentialHash storedHash = mStorage.readPasswordHash(userId);
        return verifyCredential(userId, storedHash, password, hasChallenge, challenge,
                new CredentialUtil() {