[nginx] Fixed wrong URI after try_files in nested location (tick...

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/2797b4347a2a
branches:  stable-1.8
changeset: 6341:2797b4347a2a
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Sun Aug 16 10:51:34 2015 +0300
description:
Fixed wrong URI after try_files in nested location (ticket #97).

The following configuration with alias, nested location and try_files
resulted in wrong file being used.  Request "/foo/test.gif" tried to
use "/tmp//foo/test.gif" instead of "/tmp/test.gif":

    location /foo/ {
        alias /tmp/;
        location ~ gif {
            try_files $uri =405;
        }
    }

Additionally, rev. c985d90a8d1f introduced a regression if
the "/tmp//foo/test.gif" file was found (ticket #768).  Resulting URI
was set to "gif?/foo/test.gif", as the code used clcf->name of current
location ("location ~ gif") instead of parent one ("location /foo/").

Fix is to use r->uri instead of clcf->name in all cases in the
ngx_http_core_try_files_phase() function.  It is expected to be
already matched and identical to the clcf->name of the right
location.

diffstat:

 src/http/ngx_http_core_module.c |  8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diffs (32 lines):

diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -1273,7 +1273,7 @@ ngx_http_core_try_files_phase(ngx_http_r
             *e.pos = '\0';
 
             if (alias && alias != NGX_MAX_SIZE_T_VALUE
-                && ngx_strncmp(name, clcf->name.data, alias) == 0)
+                && ngx_strncmp(name, r->uri.data, alias) == 0)
             {
                 ngx_memmove(name, name + alias, len - alias);
                 path.len -= alias;
@@ -1357,6 +1357,8 @@ ngx_http_core_try_files_phase(ngx_http_r
             }
 
         } else {
+            name = r->uri.data;
+
             r->uri.len = alias + path.len;
             r->uri.data = ngx_pnalloc(r->pool, r->uri.len);
             if (r->uri.data == NULL) {
@@ -1364,8 +1366,8 @@ ngx_http_core_try_files_phase(ngx_http_r
                 return NGX_OK;
             }
 
-            p = ngx_copy(r->uri.data, clcf->name.data, alias);
-            ngx_memcpy(p, name, path.len);
+            p = ngx_copy(r->uri.data, name, alias);
+            ngx_memcpy(p, path.data, path.len);
         }
 
         ngx_http_set_exten(r);