From 35da764125727eb1c14651b35b7dc15f1e199c8a Mon Sep 17 00:00:00 2001
From: JW Wang <wangchun@google.com>
Date: Tue, 28 Jul 2020 12:49:30 +0800
Subject: [PATCH] Fix #addChildSessionId (2/n)

A multi-session can't be a child.

Bug: 162286562
Test: Will be added in next CLs
Change-Id: I7e9957f0cd57fe924cfb5ba8f0cfb27b045f26dc
---
 .../java/com/android/server/pm/PackageInstallerSession.java   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/services/core/java/com/android/server/pm/PackageInstallerSession.java b/services/core/java/com/android/server/pm/PackageInstallerSession.java
index 2a10a1959c433..ff96c9173d594 100644
--- a/services/core/java/com/android/server/pm/PackageInstallerSession.java
+++ b/services/core/java/com/android/server/pm/PackageInstallerSession.java
@@ -3101,6 +3101,10 @@ public class PackageInstallerSession extends IPackageInstallerSession.Stub {
             throw new IllegalStateException("Unable to add child session " + childSessionId
                     + " as it does not exist.");
         }
+        if (childSession.params.isMultiPackage) {
+            throw new IllegalStateException("Multi-session " + childSessionId
+                    + " can't be a child.");
+        }
 
         try {
             acquireTransactionLock();