[nginx] Fixed "return" with discarding invalid chunked body.

[Sergey Kandaurov]

details:   https://hg.nginx.org/nginx/rev/a7e8f953408e
branches:  
changeset: 7563:a7e8f953408e
user:      Sergey Kandaurov <pluknet at nginx.com>
date:      Wed Sep 04 13:33:51 2019 +0300
description:
Fixed "return" with discarding invalid chunked body.

When ngx_http_discard_request_body() call was added to ngx_http_send_response(),
there were no return codes other than NGX_OK and NGX_HTTP_INTERNAL_SERVER_ERROR.
Now it can also return NGX_HTTP_BAD_REQUEST, but ngx_http_send_response() still
incorrectly transforms it to NGX_HTTP_INTERNAL_SERVER_ERROR.

The fix is to propagate ngx_http_discard_request_body() errors.

diffstat:

 src/http/ngx_http_core_module.c |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (16 lines):

diff -r 52b5ee64fe11 -r a7e8f953408e src/http/ngx_http_core_module.c
--- a/src/http/ngx_http_core_module.c	Tue Sep 03 17:26:56 2019 +0300
+++ b/src/http/ngx_http_core_module.c	Wed Sep 04 13:33:51 2019 +0300
@@ -1660,8 +1660,10 @@ ngx_http_send_response(ngx_http_request_
     ngx_buf_t    *b;
     ngx_chain_t   out;
 
-    if (ngx_http_discard_request_body(r) != NGX_OK) {
-        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+    rc = ngx_http_discard_request_body(r);
+
+    if (rc != NGX_OK) {
+        return rc;
     }
 
     r->headers_out.status = status;