Fix a buffer overflow problem which could allow unauthorized access.

Reviewed by: Marc Slemko, Randy Terbush, Ben Laurie
Submitted by: Alfred Huger <ahuger@secnet.com>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3@77419 13f79535-47bb-0310-9956-ffa450edef68