From 33ee4bf18b51ba78f76e6f3302a21ef7550ae35c Mon Sep 17 00:00:00 2001
From: Joe LaPenna <jlapenna@google.com>
Date: Fri, 1 Apr 2016 13:37:37 -0700
Subject: Fix NPE in AlarmManager.cancel(...)

If AlarmManager.cancel is called before any component has had a chance
to register an alarm, sWrappers will not have been set, as it is only
initialized in setImpl.

When cancelling an alarm and sWrappers does not exist, log a warning and
return early.

BUG: 27972657
Change-Id: Ied10719ba1d154f97eecfc32f429fd9ce39bf747
---
 core/java/android/app/AlarmManager.java | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/core/java/android/app/AlarmManager.java b/core/java/android/app/AlarmManager.java
index cb2130c4528e..e4fff9dc8a8c 100644
--- a/core/java/android/app/AlarmManager.java
+++ b/core/java/android/app/AlarmManager.java
@@ -905,10 +905,12 @@ public class AlarmManager {
 
         ListenerWrapper wrapper = null;
         synchronized (AlarmManager.class) {
-            final WeakReference<ListenerWrapper> wrapperRef;
-            wrapperRef = sWrappers.get(listener);
-            if (wrapperRef != null) {
-                wrapper = wrapperRef.get();
+            if (sWrappers != null) {
+                final WeakReference<ListenerWrapper> wrapperRef;
+                wrapperRef = sWrappers.get(listener);
+                if (wrapperRef != null) {
+                    wrapper = wrapperRef.get();
+                }
             }
         }
 
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