[Companion] Prevent NPE in CallbackProxy

Fixes: 63383044
Test: Ensure all fields of CompanionDeviceManager.CallbackProxy are
null-checked in onSuccess and onFailure
Change-Id: If95a46686f74d184bccfcb2d8c8195add4747a07

1 files changed, 14 insertions, 2 deletions

diff --git a/core/java/android/companion/CompanionDeviceManager.java b/core/java/android/companion/CompanionDeviceManager.java
index 86a30cf0c846..076deab5d211 100644
--- a/core/java/android/companion/CompanionDeviceManager.java
+++ b/core/java/android/companion/CompanionDeviceManager.java
@@ -280,12 +280,24 @@ public final class CompanionDeviceManager {
 
         @Override
         public void onSuccess(PendingIntent launcher) {
-            mHandler.post(() -> mCallback.onDeviceFound(launcher.getIntentSender()));
+            Handler handler = mHandler;
+            if (handler == null) return;
+            handler.post(() -> {
+                Callback callback = mCallback;
+                if (callback == null) return;
+                callback.onDeviceFound(launcher.getIntentSender());
+            });
         }
 
         @Override
         public void onFailure(CharSequence reason) {
-            mHandler.post(() -> mCallback.onFailure(reason));
+            Handler handler = mHandler;
+            if (handler == null) return;
+            handler.post(() -> {
+                Callback callback = mCallback;
+                if (callback == null) return;
+                callback.onFailure(reason);
+            });
         }
 
         @Override