[nginx] HTTP/2: fixed saving preread buffer to temp file (ticket #1143).

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/16487f9e6665
branches:  stable-1.10
changeset: 6890:16487f9e6665
user:      Valentin Bartenev <vbart at nginx.com>
date:      Mon Nov 28 19:19:21 2016 +0300
description:
HTTP/2: fixed saving preread buffer to temp file (ticket #1143).

Previously, a request body bigger than "client_body_buffer_size" wasn't written
into a temporary file if it has been pre-read entirely.  The preread buffer
is freed after processing, thus subsequent use of it might result in sending
corrupted body or cause a segfault.

diffstat:

 src/http/v2/ngx_http_v2.c |  3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diffs (13 lines):

diff --git a/src/http/v2/ngx_http_v2.c b/src/http/v2/ngx_http_v2.c
--- a/src/http/v2/ngx_http_v2.c
+++ b/src/http/v2/ngx_http_v2.c
@@ -3560,6 +3560,9 @@ ngx_http_v2_read_request_body(ngx_http_r
         rb->buf = ngx_create_temp_buf(r->pool, (size_t) len);
 
     } else {
+        /* enforce writing body to file */
+        r->request_body_in_file_only = 1;
+
         rb->buf = ngx_calloc_buf(r->pool);
 
         if (rb->buf != NULL) {