From 1d6c0efc202a21942321ffa3b83b7c9309e66c9a Mon Sep 17 00:00:00 2001
From: Jim Miller <jaggies@google.com>
Date: Wed, 10 Aug 2016 15:43:17 -0700
Subject: Fix vulnerability in LockSettings service

Fixes bug 30003944

Change-Id: I8700d4424c6186c8d5e71d2fdede0223ad86904d
(cherry picked from commit 2d71384a139ae27cbc7b57f06662bf6ee2010f2b)
---
 core/java/com/android/internal/widget/LockPatternUtils.java    | 4 ++--
 services/core/java/com/android/server/LockSettingsService.java | 6 ++++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/core/java/com/android/internal/widget/LockPatternUtils.java b/core/java/com/android/internal/widget/LockPatternUtils.java
index 60380fb..0aef320 100644
--- a/core/java/com/android/internal/widget/LockPatternUtils.java
+++ b/core/java/com/android/internal/widget/LockPatternUtils.java
@@ -291,7 +291,7 @@ public class LockPatternUtils {
                 return false;
             }
         } catch (RemoteException re) {
-            return true;
+            return false;
         }
     }
 
@@ -340,7 +340,7 @@ public class LockPatternUtils {
                 return false;
             }
         } catch (RemoteException re) {
-            return true;
+            return false;
         }
     }
 
diff --git a/services/core/java/com/android/server/LockSettingsService.java b/services/core/java/com/android/server/LockSettingsService.java
index 55682c2..6cb2875 100644
--- a/services/core/java/com/android/server/LockSettingsService.java
+++ b/services/core/java/com/android/server/LockSettingsService.java
@@ -519,6 +519,9 @@ 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;
 
@@ -575,6 +578,9 @@ 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() {
-- 
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