Added gaurd against long overflow in linear

Linear backoff algorithm could result in long overflow
causing a negative number to be returned that would cause the
application to crash.

src/main/java/com/hms_networks/americas/sc/retry/AutomaticRetryCodeLinear.java

@@ -17,11 +17,20 @@ public abstract class AutomaticRetryCodeLinear extends AutomaticRetryCode {
  * @return number of milliseconds delay before specified retry number
  */
  protected long getDelayMillisBeforeRetry(int retry) {
- long delayMillisBeforeRetry = retry * getLinearSlopeMillis();
 
- // Check if above maximum delay, set to maximum if larger
- if (delayMillisBeforeRetry > getMaxDelayMillisBeforeRetry()) {
- delayMillisBeforeRetry = getMaxDelayMillisBeforeRetry();
+ long delayMillisBeforeRetry = 0;
+
+ // Check that delayMillisBeforeRetry will not overflow long
+ if ((Long.MAX_VALUE / getLinearSlopeMillis()) > retry) {
+ delayMillisBeforeRetry = retry * getLinearSlopeMillis();
+
+ // Check if above maximum delay, set to maximum if larger
+ if (delayMillisBeforeRetry > getMaxDelayMillisBeforeRetry()) {
+ delayMillisBeforeRetry = getMaxDelayMillisBeforeRetry();
+ }
+ } else {
+ // If retry number is large enough to cause long overflow, set to max long.
+ delayMillisBeforeRetry = Long.MAX_VALUE;
  }
 
  return delayMillisBeforeRetry;