Parfait analysis of GNU sed 4.2.2

Hi,

I'm in the process of updating the version of GNU sed that's in
the Oracle Solaris O/S to 4.2.2. Part of this update requires
a security audit, including running the Parfait static code analysis
tool on the GNU sed code.

For more information on parfait, see the paper:

http://labs.oracle.com/projects/downunder/publications/pepm09.pdf

Anyhoo, parfait found the following error:

Error: Buffer overrun
    Buffer overflow (CWE 120): In array dereference of 
((char*)(word_limit + -1))[12] with index '-1+12'
       Array size is 32000 bytes, -1+12 is -20
         at line 257 of components/sed/sed-4.2.2/sed/fmt.c in function 
'get_paragraph'.
    Read outside array bounds (CWE 125): In array dereference of 
((char*)(word_limit + -1))[12] with index '-1+12'
       Array size is 32000 bytes, -1+12 is -20
         at line 257 of components/sed/sed-4.2.2/sed/fmt.c in function 
'get_paragraph'.

You might wish to review this and see if it is a real problem that
need addressing (as opposed to a false positive).

Thanks.