Merge "Check for invalid (negative) string pool pos." into sc-dev am: 59bad728e2 am: 9336680fe5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15390628

Change-Id: Iae777af3410b51509ff39c6619084a765909522d

core/java/android/content/pm/PackageParserCacheHelper.java

@@ -56,6 +56,9 @@ public class PackageParserCacheHelper {
             mStrings.clear();
 
             final int poolPosition = mParcel.readInt();
+            if (poolPosition < 0) {
+                throw new IllegalStateException("Invalid string pool position: " + poolPosition);
+            }
             final int startPosition = mParcel.dataPosition();
 
             // The pool is at the end of the parcel.