bin/51652: makefs dies due to segmentation fault

[venture37%geeklan.co.uk@localhost]

>Number:         51652
>Category:       bin
>Synopsis:       makefs dies due to segmentation fault
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Nov 25 19:35:00 +0000 2016
>Originator:     Sevan Janiyan
>Release:        NetBSD-Head
>Organization:
>Environment:
NetBSD 7.99.42 (GENERIC) #0: Sat Nov 12 17:28:54 UTC 2016 amd64 x86_64
>Description:
Running makefs with a trivial test case of a couple of empty directories results in a coredump.

Is is also present on downstream consumers such as FreeBSD
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212370

Heads up by Sascha Wildner.

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Reading symbols from /usr/sbin/makefs...(no debugging symbols found)...done.
[New process 1]
Core was generated by `makefs'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x0000000124407931 in cd9660_convert_structure ()
(gdb) bt
#0  0x0000000124407931 in cd9660_convert_structure ()
#1  0x00000001244092f4 in cd9660_makefs ()
#2  0x000000012442f5a2 in main ()
>How-To-Repeat:
mkdir /tmp/isoroot; cd /tmp/isoroot; mkdir t T; makefs -t cd9660 /tmp/t.iso .
>Fix: