[ActivityManager] Fix IndexOutOfBoundsException

Symptom:
The stack was deleted during cleanup, so the stack
list size has reduced by one and cause this issue.

IndexOutOfBoundsException: Invalid index 1, size is 1

Change-Id: Ic6722aed98a0ad789b331d00e89cb74bf3b36d4c

diff --git a/services/core/java/com/android/server/am/ActivityStackSupervisor.java b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
index af6f185..1195e83 100644 (file)
--- a/services/core/java/com/android/server/am/ActivityStackSupervisor.java
+++ b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
@@ -2670,8 +2670,7 @@ public final class ActivityStackSupervisor implements DisplayListener {
         boolean didSomething = false;
         for (int displayNdx = mActivityDisplays.size() - 1; displayNdx >= 0; --displayNdx) {
             final ArrayList<ActivityStack> stacks = mActivityDisplays.valueAt(displayNdx).mStacks;
-            final int numStacks = stacks.size();
-            for (int stackNdx = 0; stackNdx < numStacks; ++stackNdx) {
+            for (int stackNdx = stacks.size() - 1; stackNdx >= 0; --stackNdx) {
                 final ActivityStack stack = stacks.get(stackNdx);
                 if (stack.finishDisabledPackageActivitiesLocked(
                         packageName, filterByClasses, doit, evenPersistent, userId)) {