Fix NPE in TTS service if no engine string

Test: added test in TextToSpeechServiceTest
Bug: 232438498
Change-Id: Ia587d34e2898930c0956024c56a1f19debb445e4

1 files changed, 6 insertions, 0 deletions

diff --git a/services/texttospeech/java/com/android/server/texttospeech/TextToSpeechManagerService.java b/services/texttospeech/java/com/android/server/texttospeech/TextToSpeechManagerService.java
index 9015563f439e..24114988d6ba 100644
--- a/services/texttospeech/java/com/android/server/texttospeech/TextToSpeechManagerService.java
+++ b/services/texttospeech/java/com/android/server/texttospeech/TextToSpeechManagerService.java
@@ -63,6 +63,12 @@ public final class TextToSpeechManagerService extends
         public void createSession(String engine,
                 ITextToSpeechSessionCallback sessionCallback) {
             synchronized (mLock) {
+                if (engine == null) {
+                    runSessionCallbackMethod(
+                            () -> sessionCallback.onError("Engine cannot be null"));
+                    return;
+                }
+
                 TextToSpeechManagerPerUserService perUserService = getServiceForUserLocked(
                         UserHandle.getCallingUserId());
                 if (perUserService != null) {