bin/56918: telnet crash on 1) set ' ' crash 2) unset ' ' 3) help help

[simon%josefsson.org@localhost]

>Number:         56918
>Category:       bin
>Synopsis:       telnet crash on 1) set ' ' crash 2) unset ' ' 3) help help
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jul 08 19:25:00 +0000 2022
>Originator:     Simon Josefsson
>Release:        9.2
>Organization:
>Environment:
NetBSD gcc300 9.2 NetBSD 9.2 (GENERIC) #0: Wed May 12 13:15:55 UTC 2021  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64

>Description:
Hi.  I maintain GNU InetUtils which contains a telnet implementation that share origins with BSD code, and I can reproduce the bug reports we got on NetBSD 9.2 as follows.  See discussions in https://lists.gnu.org/archive/html/bug-inetutils/2022-07/ with the fixes we adopted for these problems.

It would be nice to coordinate patches and code syncs, if there is anyone in the NetBSD community that is interested in working with us in the GNU InetUtils community!

Reported to FreeBSD as well here: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265097

/Simon
>How-To-Repeat:
gcc300$ telnet
telnet> set ' ' crash
[1]   Segmentation fault (core dumped) telnet
gcc300$ telnet
telnet>  unset ' '
[1]   Segmentation fault (core dumped) telnet
gcc300$ telnet
telnet> help help
[1]   Segmentation fault (core dumped) telnet
gcc300$ 
>Fix:
See posts to https://lists.gnu.org/archive/html/bug-inetutils/2022-07/ with the fixes we used.