Sanity check network stats coming from disk.

Throw early when structure is unstable, which allows the normal
recoverFromWtf() path to recover automatically.

Bug: 7440485
Change-Id: Ic150d17daac4de7c9ff3489025403a9b485b4620

core/java/android/net/NetworkStatsHistory.java

@@ -177,6 +177,12 @@ public class NetworkStatsHistory implements Parcelable {
                 throw new ProtocolException("unexpected version: " + version);
             }
         }
+
+        if (bucketStart.length != bucketCount || rxBytes.length != bucketCount
+                || rxPackets.length != bucketCount || txBytes.length != bucketCount
+                || txPackets.length != bucketCount || operations.length != bucketCount) {
+            throw new ProtocolException("Mismatched history lengths");
+        }
     }
 
     public void writeToStream(DataOutputStream out) throws IOException {