amd64/153659: awk segfaults when trying to extract a combination of special characters

[Olivier]

>Number:         153659
>Category:       amd64
>Synopsis:       awk segfaults when trying to extract a combination of special characters
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jan 03 20:00:29 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Olivier
>Release:        8.1
>Organization:
interfaSys Ltd
>Environment:
FreeBSD 8.1-STABLE FreeBSD 8.1-STABLE #0 r213396 amd64

>Description:
awk seg faults when it has to deal with at least one sequence of characters.
This makes it crash: %*
I don't know if it happens with other combinations
>How-To-Repeat:
# edit conf
Type this
GPG_PW='%*'

# edit awk_test.sh
Type this
awk '/^[ \t]*GPG_PW[ \t=]/{\
        sub(/^[ \t]*GPG_PW[ \t]*=*/,"",$0);\
        gsub(/^[ \t]*[\047"]|[\047"][ \t]*$/,"",$0);\
        printf $0; exit}' "$1"


Now try to extract GPG_PW
# ./awk_test.sh conf

You will get this:
./awk_test.sh: line 4: 18676 Segmentation fault: 11  (core dumped) awk '/^[ \t]*GPG_PW[ \t=]/{\
        sub(/^[ \t]*GPG_PW[ \t]*=*/,"",$0);\
        gsub(/^[ \t]*[\047"]|[\047"][ \t]*$/,"",$0);\
        printf $0; exit}' "$1"

>Fix:
I'm not aware of any fixes

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