[nginx] Postpone filter: handled ngx_http_postpone_filter_add() failures.

[Sergey Kandaurov]

details:   http://hg.nginx.org/nginx/rev/d87f29d764ce
branches:  
changeset: 7134:d87f29d764ce
user:      Sergey Kandaurov <pluknet at nginx.com>
date:      Mon Oct 16 13:13:25 2017 +0300
description:
Postpone filter: handled ngx_http_postpone_filter_add() failures.

In particular, if ngx_http_postpone_filter_add() fails in ngx_chain_add_copy(),
the output chain of the postponed request was left in an invalid state.

diffstat:

 src/http/ngx_http_postpone_filter_module.c |  9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diffs (26 lines):

diff -r dc3b3cfd5d23 -r d87f29d764ce src/http/ngx_http_postpone_filter_module.c
--- a/src/http/ngx_http_postpone_filter_module.c	Fri Oct 13 00:32:26 2017 +0300
+++ b/src/http/ngx_http_postpone_filter_module.c	Mon Oct 16 13:13:25 2017 +0300
@@ -63,7 +63,10 @@ ngx_http_postpone_filter(ngx_http_reques
     if (r != c->data) {
 
         if (in) {
-            ngx_http_postpone_filter_add(r, in);
+            if (ngx_http_postpone_filter_add(r, in) != NGX_OK) {
+                return NGX_ERROR;
+            }
+
             return NGX_OK;
         }
 
@@ -86,7 +89,9 @@ ngx_http_postpone_filter(ngx_http_reques
     }
 
     if (in) {
-        ngx_http_postpone_filter_add(r, in);
+        if (ngx_http_postpone_filter_add(r, in) != NGX_OK) {
+            return NGX_ERROR;
+        }
     }
 
     do {