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

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

Change-Id: Idcdd73f51cab13a188cf6391954662a3c74243b9

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.