Author: ae
Date: Mon Oct 12 07:53:04 2015
New Revision: 289171
URL: https://svnweb.freebsd.org/changeset/base/289171

Log:
  MFC r288528:
    Fix possible segmentation fault.
  
    PR:         203494

Modified:
  stable/9/sbin/ipfw/ipfw2.c
Directory Properties:
  stable/9/sbin/ipfw/   (props changed)

Modified: stable/9/sbin/ipfw/ipfw2.c
==============================================================================
--- stable/9/sbin/ipfw/ipfw2.c  Mon Oct 12 07:50:27 2015        (r289170)
+++ stable/9/sbin/ipfw/ipfw2.c  Mon Oct 12 07:53:04 2015        (r289171)
@@ -2979,7 +2979,7 @@ ipfw_add(char *av[])
                action->opcode = O_NAT;
                action->len = F_INSN_SIZE(ipfw_insn_nat);
                CHECK_ACTLEN;
-               if (_substrcmp(*av, "global") == 0) {
+               if (*av != NULL && _substrcmp(*av, "global") == 0) {
                        action->arg1 = 0;
                        av++;
                        break;
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