6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash

Interval checking is now being performed on the values passed in for these two flags. The current acceptable range for RefDiscoveryPolicy is [0..1], and for TLABWasteTargetPercent it is [1..100].

Reviewed-by: apetrusenko, ysr

hotspot/src/share/vm/runtime/arguments.cpp

@@ -1487,6 +1487,20 @@ bool Arguments::created_by_java_launcher() {
 //===========================================================================================================
 // Parsing of main arguments
 
+bool Arguments::verify_interval(uintx val, uintx min,
+                                uintx max, const char* name) {
+  // Returns true iff value is in the inclusive interval [min..max]
+  // false, otherwise.
+  if (val >= min && val <= max) {
+    return true;
+  }
+  jio_fprintf(defaultStream::error_stream(),
+              "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
+              " and " UINTX_FORMAT "\n",
+              name, val, min, max);
+  return false;
+}
+
 bool Arguments::verify_percentage(uintx value, const char* name) {
   if (value <= 100) {
     return true;
@@ -1723,6 +1737,16 @@ bool Arguments::check_vm_args_consistency() {
     status = false;
   }
 
+  status = status && verify_interval(RefDiscoveryPolicy,
+                                     ReferenceProcessor::DiscoveryPolicyMin,
+                                     ReferenceProcessor::DiscoveryPolicyMax,
+                                     "RefDiscoveryPolicy");
+
+  // Limit the lower bound of this flag to 1 as it is used in a division
+  // expression.
+  status = status && verify_interval(TLABWasteTargetPercent,
+                                     1, 100, "TLABWasteTargetPercent");
+
   return status;
 }