[nginx] Cache: fixed cache valid slot to reject incorrect statuses.

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/7c614ef3c6ea
branches:  
changeset: 7267:7c614ef3c6ea
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Wed Apr 18 16:11:41 2018 +0300
description:
Cache: fixed cache valid slot to reject incorrect statuses.

Previously, result of ngx_atoi() was assigned to an ngx_uint_t variable,
and errors reported by ngx_atoi() became positive, so the following check
in "status < 100" failed to catch them.  This resulted in the configurations
like "proxy_cache_valid 2xx 30s" being accepted as correct, while they
in fact do nothing.  Changing type to ngx_int_t fixes this, and such
configurations are now properly rejected.

diffstat:

 src/http/ngx_http_file_cache.c |  3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diffs (13 lines):

diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -2620,7 +2620,8 @@ ngx_http_file_cache_valid_set_slot(ngx_c
 
     time_t                    valid;
     ngx_str_t                *value;
-    ngx_uint_t                i, n, status;
+    ngx_int_t                 status;
+    ngx_uint_t                i, n;
     ngx_array_t             **a;
     ngx_http_cache_valid_t   *v;
     static ngx_uint_t         statuses[] = { 200, 301, 302 };