[Bug 255491] null pointer dereference in ipfw.c

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255491

            Bug ID: 255491
           Summary: null pointer dereference in ipfw.c
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: haisheng.zhouz at hotmail.com

Created attachment 224536
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=224536&action=edit
screenshots of  Bug analysis

when i use the command #ipfw -t add allow tcp from any to any out
there is a "Segmentation fault(core dumped)"

In this commad  "ipfw" and "-t"or"-T" and  "add" is needed.

It is because  lin 5362 of ipfw2.c  
  show_static_rule(&g_co, &sfo, &bp, rule, NULL); the last parameter is NULL

and then  line 2195 in ipfw2.c

  if (cntr->timestamp > 0) {   //the "cntr" is NULL

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