Merge "Add validity check to detect invalid PDUs." into sc-dev am: 54b18bd8e8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14523947

Change-Id: I3dba2a5a9a71c1a6c3a84b0549301bb2e229e640

telephony/common/com/google/android/mms/pdu/PduParser.java

@@ -1550,6 +1550,11 @@ public class PduParser {
         if (cur < TEXT_MIN) {
             int length = parseValueLength(pduDataStream);
             int startPos = pduDataStream.available();
+            if (length > startPos) {
+                Log.e(LOG_TAG, "parseContentType: Invalid length " + length
+                        + " when available bytes are " + startPos);
+                return (PduContentTypes.contentTypes[0]).getBytes(); //"*/*"
+            }
             pduDataStream.mark(1);
             temp = pduDataStream.read();
             assert(-1 != temp);