o Fixed a division by zero error in the packet rate measuring code

that could cause a display of infinity packets per seconds near the
  start of a scan. [Jah]

CHANGELOG

@@ -1,5 +1,9 @@
 # Nmap Changelog ($Id$); -*-text-*-
 
+o Fixed a division by zero error in the packet rate measuring code
+  that could cause a display of infinity packets per seconds near the
+  start of a scan. [Jah]
+
 o Complete re-write of the marshalling logic for Microsoft RPC calls. 
   [Ron Bowes]
 

timing.cc

@@ -349,7 +349,13 @@ void RateMeter::update(double amount, const struct timeval *now) {
 }
 
 double RateMeter::getOverallRate(const struct timeval *now) const {
-  return total / elapsedTime(now);
+  double elapsed;
+
+  elapsed = elapsedTime(now);
+  if (elapsed <= 0.0)
+    return 0.0;
+  else
+    return total / elapsed;
 }
 
 /* Get the "current" rate (actually a moving average of the last