linkToDeath exception cause system server crash
java.util.NoSuchElementException: Death link does not exist
when linkToDeath has remote exception, unlinkToDeath will fail and
throw NoSuchElementException, catch it in AbstractAccessibilityServiceConnection
to avoid system server crash.
Bug: 157580692
Test: manual
Change-Id: I42ce3a458e04539d76555679279d1368e0c61ae0
diff --git a/diff b/diff
new file mode 100644
index 0000000..5c75d88
--- /dev/null
+++ b/diff
@@ -0,0 +1,25 @@
+diff --git a/services/accessibility/java/com/android/server/accessibility/AbstractAccessibilityServiceConnection.java b/services/accessibility/java/com/android/server/accessibility/AbstractAccessibilityServiceConnection.java
+index fc43882..832dc91 100644
+--- a/services/accessibility/java/com/android/server/accessibility/AbstractAccessibilityServiceConnection.java
++++ b/services/accessibility/java/com/android/server/accessibility/AbstractAccessibilityServiceConnection.java
+@@ -67,6 +67,7 @@ import java.util.Arrays;
+ import java.util.HashSet;
+ import java.util.List;
+ import java.util.Set;
++import java.util.NoSuchElementException;
+
+ /**
+ * This class represents an accessibility client - either an AccessibilityService or a UiAutomation.
+@@ -978,7 +979,11 @@ abstract class AbstractAccessibilityServiceConnection extends IAccessibilityServ
+ /* ignore */
+ }
+ if (mService != null) {
+- mService.unlinkToDeath(this, 0);
++ try {
++ mService.unlinkToDeath(this, 0);
++ }catch(NoSuchElementException e) {
++ Slog.e(LOG_TAG, "Failed unregistering death link");
++ }
+ mService = null;
+ }
+
diff --git a/services/accessibility/java/com/android/server/accessibility/AbstractAccessibilityServiceConnection.java b/services/accessibility/java/com/android/server/accessibility/AbstractAccessibilityServiceConnection.java
index 6b852ad..40a2816 100644
--- a/services/accessibility/java/com/android/server/accessibility/AbstractAccessibilityServiceConnection.java
+++ b/services/accessibility/java/com/android/server/accessibility/AbstractAccessibilityServiceConnection.java
@@ -90,6 +90,7 @@
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
+import java.util.NoSuchElementException;
import java.util.Set;
/**
@@ -1179,7 +1180,11 @@
/* ignore */
}
if (mService != null) {
- mService.unlinkToDeath(this, 0);
+ try {
+ mService.unlinkToDeath(this, 0);
+ } catch (NoSuchElementException e) {
+ Slog.e(LOG_TAG, "Failed unregistering death link");
+ }
mService = null;
}