From 42122c270a06583acdd79992e9257e02d253d008 Mon Sep 17 00:00:00 2001
From: Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
Date: Sat, 8 Nov 2014 10:31:53 +0900
Subject: [PATCH] Don't reprioritize stream if it is not in dependency tree

Normally stream is in dependency tree, but sometimes it isn't.  For
example, client does not put pushed reserved stream in dependency
tree.
---
 lib/nghttp2_session.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/nghttp2_session.c b/lib/nghttp2_session.c
index af4bd872..d3fd30a9 100644
--- a/lib/nghttp2_session.c
+++ b/lib/nghttp2_session.c
@@ -573,6 +573,10 @@ int nghttp2_session_reprioritize_stream
   nghttp2_stream *dep_stream;
   nghttp2_stream *root_stream;
 
+  if(!nghttp2_stream_in_dep_tree(stream)) {
+    return 0;
+  }
+
   if(pri_spec->stream_id == stream->stream_id) {
     return nghttp2_session_terminate_session_with_reason
       (session, NGHTTP2_PROTOCOL_ERROR, "depend on itself");