[Bug 255491] null pointer dereference in ipfw.c

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

--- Comment #3 from commit-hook at FreeBSD.org ---
A commit in branch stable/13 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=80b22e631506a3d6d783fa42424502d32d1f417f

commit 80b22e631506a3d6d783fa42424502d32d1f417f
Author:     Lutz Donnerhacke <donner at FreeBSD.org>
AuthorDate: 2021-04-30 14:12:47 +0000
Commit:     Lutz Donnerhacke <donner at FreeBSD.org>
CommitDate: 2021-05-09 12:33:28 +0000

    sbin/ipfw: Fix null pointer deference when printing counters

    ipfw -[tT] prints statistics of the last access. If the rule was never
    used, the counter might be not exist.  This happens unconditionally on
    inserting a new rule.  Avoid printing statistics in this case.

    PR:     255491
    Reported by:    Haisheng Zhouz
    Reviewed by:    ae
    Differential Revision:  https://reviews.freebsd.org/D30046

    (cherry picked from commit bf7cc0f9cb6603a6bdd6131c8d1939724ce6e62d)

 sbin/ipfw/ipfw2.c | 51 +++++++++++++++++++++++++++------------------------
 1 file changed, 27 insertions(+), 24 deletions(-)

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