From cd2085be0c497153f9311f0a1986c6be6a18cff4 Mon Sep 17 00:00:00 2001
From: Valentin Bartenev <vbart@nginx.com>
Date: Thu, 16 Jun 2016 20:55:11 +0300
Subject: [PATCH] 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.
---
 src/http/v2/ngx_http_v2.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/http/v2/ngx_http_v2.c b/src/http/v2/ngx_http_v2.c
index 94f57a717..99cb3fc70 100644
--- 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_connection_t *h2c,
     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_connection_t *h2c,
     }
 
     stream->rst_sent = 1;
+    stream->skip_data = 1;
 
     fc = stream->request->connection;
     fc->error = 1;