From: Roman Arutyunyan <arut@nginx.com>
Date: Tue, 8 Dec 2015 14:39:56 +0000 (+0300)
Subject: Slice filter: never run subrequests when main request is buffered.
X-Git-Tag: release-1.9.8~2
X-Git-Url: http://www.kaiwu.me/postgresql/commit/static/gitweb.js?a=commitdiff_plain;h=5c1f76f0e933335784ebb4811965230ab8f20233;p=nginx.git

Slice filter: never run subrequests when main request is buffered.

With main request buffered, it's possible, that a slice subrequest will send
output before it.  For example, while main request is waiting for aio read to
complete, a slice subrequest can start an aio operation as well.  The order
in which aio callbacks are called is undetermined.
---

diff --git a/src/http/modules/ngx_http_slice_filter_module.c b/src/http/modules/ngx_http_slice_filter_module.c
index 8cdb9bc6f..aa2a0344c 100644
--- a/src/http/modules/ngx_http_slice_filter_module.c
+++ b/src/http/modules/ngx_http_slice_filter_module.c
@@ -239,6 +239,10 @@ ngx_http_slice_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
         return rc;
     }
 
+    if (r->buffered) {
+        return rc;
+    }
+
     if (ngx_http_subrequest(r, &r->uri, &r->args, &sr, NULL, 0) != NGX_OK) {
         return NGX_ERROR;
     }