--- nmap.cc.orig	2012-11-11 14:29:17.768998606 -0800
+++ nmap.cc	2012-11-21 14:48:07.069997940 -0800
@@ -2257,7 +2257,19 @@
 
   /* Ensure the log file ends with a newline */
   filestr[filelen - 1] = '\n';
-  munmap(filestr, filelen);
+
+  /* 
+   * we cannot recover from a munmap() failure, but
+   * we can print out an informative message with
+   * the address location and size of the memory
+   * mapping which wasn't released by munmap().
+   */
+
+  if (munmap(filestr, filelen) != 0) {
+    error("Warning: unable to unmap memory at address %p and size %u.\n", filestr, filelen);
+    error("value of 'errno' is: %s \n", strerror(errno));
+  }
+
   return 0;
 }