[nginx] Referer: fixed hostname buffer overflow check.

[Sergey Kandaurov]

details:   http://hg.nginx.org/nginx/rev/ec0be12c8e29
branches:  
changeset: 5352:ec0be12c8e29
user:      Valentin Bartenev <vbart at nginx.com>
date:      Thu Aug 29 22:35:54 2013 +0400
description:
Referer: fixed hostname buffer overflow check.

Because of premature check the effective buffer size was 255 symbols
while the buffer is able to handle 256.

diffstat:

 src/http/modules/ngx_http_referer_module.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (19 lines):

diff -r a2c772963b04 -r ec0be12c8e29 src/http/modules/ngx_http_referer_module.c
--- a/src/http/modules/ngx_http_referer_module.c	Thu Aug 29 22:35:27 2013 +0400
+++ b/src/http/modules/ngx_http_referer_module.c	Thu Aug 29 22:35:54 2013 +0400
@@ -178,12 +178,12 @@ valid_scheme:
             break;
         }
 
-        buf[i] = ngx_tolower(*p);
-        key = ngx_hash(key, buf[i++]);
-
         if (i == 256) {
             goto invalid;
         }
+
+        buf[i] = ngx_tolower(*p);
+        key = ngx_hash(key, buf[i++]);
     }
 
     uri = ngx_hash_find_combined(&rlcf->hash, key, buf, p - ref);