[nginx] HTTP/2: prevented double termination of a stream.

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/20485a482bc0
branches:  stable-1.10
changeset: 6753:20485a482bc0
user:      Valentin Bartenev <vbart at nginx.com>
date:      Thu Jun 16 20:55:11 2016 +0300
description:
HTTP/2: prevented double termination of a stream.

According to RFC 7540, an endpoint should not send more than one RST_STREAM
frame for any stream.

Also, now all the data frames will be skipped while termination.

diffstat:

 src/http/v2/ngx_http_v2.c |  5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diffs (22 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
@@ -3890,6 +3890,10 @@ ngx_http_v2_terminate_stream(ngx_http_v2
     ngx_event_t       *rev;
     ngx_connection_t  *fc;
 
+    if (stream->rst_sent) {
+        return NGX_OK;
+    }
+
     if (ngx_http_v2_send_rst_stream(h2c, stream->node->id, status)
         == NGX_ERROR)
     {
@@ -3897,6 +3901,7 @@ ngx_http_v2_terminate_stream(ngx_http_v2
     }
 
     stream->rst_sent = 1;
+    stream->skip_data = 1;
 
     fc = stream->request->connection;
     fc->error = 1;