[src/trunk]: src/libexec/httpd more for the previous: make sure [i - 1] can ...

[mrg <mrg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/8c1882fc89f6
branches:  trunk
changeset: 335120:8c1882fc89f6
user:      mrg <mrg%NetBSD.org@localhost>
date:      Fri Dec 26 19:52:00 2014 +0000

description:
more for the previous:  make sure [i - 1] can never go negative.

diffstat:

 libexec/httpd/auth-bozo.c |  4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diffs (18 lines):

diff -r 1c054f9c4385 -r 8c1882fc89f6 libexec/httpd/auth-bozo.c
--- a/libexec/httpd/auth-bozo.c Fri Dec 26 19:48:52 2014 +0000
+++ b/libexec/httpd/auth-bozo.c Fri Dec 26 19:52:00 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: auth-bozo.c,v 1.15 2014/12/26 19:48:52 mrg Exp $       */
+/*     $NetBSD: auth-bozo.c,v 1.16 2014/12/26 19:52:00 mrg Exp $       */
 
 /*     $eterna: auth-bozo.c,v 1.17 2011/11/18 09:21:15 mrg Exp $       */
 
@@ -265,7 +265,7 @@
                        | decodetable[in[i + 3]];
 #undef IN_CHECK
        }
-       while (in[i - 1] == '=')
+       while (i > 0 && in[i - 1] == '=')
                cp--,i--;
        return (cp - out);
 }