[Bug 8961] New: Bash Compatible sub string of variable when evaluating negative value causes seg fault

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=8961

            Bug ID: 8961
           Summary: Bash Compatible sub string of variable when evaluating
                    negative value causes seg fault
           Product: Busybox
           Version: 1.24.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: vapier at gentoo.org
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

When referencing a sub-string of a variable, using a negative value stored
in another variable, the shell will seg-fault.

Steps to reproduce:
/ # s=abcdefg
/ # n=2
/ # echo ${s:$n}
cdefg
/ # n=-2
/ # echo ${s:$n}
Segmentation fault

Expected behavior:
/ # s=abcdefg
/ # n=2
/ # echo ${s:$n}
cdefg
/ # n=-2
/ # echo ${s:$n}
fg

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