[nginx] Request body: removed error assumption (ticket #2058).

[Maxim Dounin]

details:   https://hg.nginx.org/nginx/rev/967cfa6e2ff8
branches:  
changeset: 7740:967cfa6e2ff8
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Mon Nov 09 22:41:54 2020 +0300
description:
Request body: removed error assumption (ticket #2058).

Before introduction of request body filter in 42d9beeb22db, the only
possible return code from the ngx_http_request_body_filter() call
without actual buffers was NGX_HTTP_INTERNAL_SERVER_ERROR, and
the code in ngx_http_read_client_request_body() hardcoded the only
possible error to simplify the code of initial call to set rb->rest.

This is no longer true after introduction of request body filters though,
as a request body filter might need to return other errors, such as 403.
Fix is to preserve the error code actually returned by the call
instead of assuming 500.

diffstat:

 src/http/ngx_http_request_body.c |  5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diffs (15 lines):

diff -r 4d5b04daeaff -r 967cfa6e2ff8 src/http/ngx_http_request_body.c
--- a/src/http/ngx_http_request_body.c	Mon Nov 09 22:40:53 2020 +0300
+++ b/src/http/ngx_http_request_body.c	Mon Nov 09 22:41:54 2020 +0300
@@ -137,8 +137,9 @@ ngx_http_read_client_request_body(ngx_ht
     } else {
         /* set rb->rest */
 
-        if (ngx_http_request_body_filter(r, NULL) != NGX_OK) {
-            rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
+        rc = ngx_http_request_body_filter(r, NULL);
+
+        if (rc != NGX_OK) {
             goto done;
         }
     }