bin/129370: sed: invalid output (memory dump) with invalid regexp and \1

[Mathieu Virbel]

>Number:         129370
>Category:       bin
>Synopsis:       sed: invalid output (memory dump) with invalid regexp and \1
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Dec 02 13:00:01 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Mathieu Virbel
>Release:        7.0-STABLE
>Organization:
NETASQ
>Environment:
FreeBSD quark 7.0-STABLE FreeBSD 7.0-STABLE #1: Thu Oct  9 16:19:45 CEST 2008     root at quark:/usr/obj/usr/src/sys/GENERIC  i386

>Description:
Instead of report an invalid regexp error, sed abort anormaly when we doing bad things like :

Command: echo 'a' | sed 's/^a/\1/'
Result: sed: realloc: Cannot allocate memory

Command: echo 'aa' | sed 's/^a/\1/'
Result: (@(@(@(@(@(@(@(@(@(@(@(@(@(@(... << memory dump.


What we would like to have
--------------------------

Command: echo 'a' | sed 's/^a/\1/'
Result: sed: -e expression #1, char 8: invalid reference \1 on `s' command's RHS
>How-To-Repeat:
Try one of these :
- echo 'a' | sed 's/^a/\1/'
- echo 'aa' | sed 's/^a/\1/'
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: