bin/53712: /bin/sh crashes on syntax error

[roland.illig%gmx.de@localhost]

>Number:         53712
>Category:       bin
>Synopsis:       /bin/sh crashes on syntax error
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Nov 08 22:10:00 +0000 2018
>Originator:     Roland Illig
>Release:        7.0.2, also current as of 2018-11-08
>Organization:
>Environment:
NetBSD nb7.fritz.box 7.0.2 NetBSD 7.0.2 (GENERIC.201610210724Z) amd64
>Description:
$ sh -c '{ } > out'
Segmentation fault (core dumped)

$ bash -c '{ } > out'
bash: -c: line 0: syntax error near unexpected token `}'
bash: -c: line 0: `{ } > out'

$ pkglint -Wall -s pkglint-test.mk
>               { } > out
WARN: pkglint-test.mk:2: Pkglint ShellLine.CheckShellCommand: parse error at []string{"}", ">", "out"}

>How-To-Repeat:

>Fix:
in bin/sh/parser.c, the crash happens in this line:

if (n1->type != NSUBSHELL) {