commit fa8712a283f4526ba417ec5a6fa98caaf1b313f6
author Roman Arutyunyan <arut@nginx.com> Fri Sep 10 12:59:22 2021 +0300
committer Roman Arutyunyan <arut@nginx.com> Fri Sep 10 12:59:22 2021 +0300
tree 0d6af875614318f2a04d7a0a25fab23137116adf
parent 3adfb71a10103904c3e3fb8f395835cef183042d

Request body: do not create temp file if there's nothing to write.

Do this only when the entire request body is empty and
r->request_body_in_file_only is set.

The issue manifested itself with missing warning "a client request body is
buffered to a temporary file" when the entire rb->buf is full and all buffers
are delayed by a filter.

src/http/ngx_http_request_body.c

diff --git a/src/http/ngx_http_request_body.c b/src/http/ngx_http_request_body.c
index 89a4c74..ad3549f 100644
--- a/src/http/ngx_http_request_body.c
+++ b/src/http/ngx_http_request_body.c
@@ -1309,7 +1309,7 @@
 
     if (rb->rest > 0) {
 
-        if (rb->buf && rb->buf->last == rb->buf->end
+        if (rb->bufs && rb->buf && rb->buf->last == rb->buf->end
             && ngx_http_write_request_body(r) != NGX_OK)
         {
             return NGX_HTTP_INTERNAL_SERVER_ERROR;