From e29ff2be2f4ae0dace025672e0289104d58adb2a Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 20 Aug 2018 13:19:08 +0200
Subject: [PATCH] http2: avoid set_stream_user_data() before stream is assigned

... before the stream is started, we have it set to -1.

Fixes #2894
Closes #2898
---
 lib/http2.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/http2.c b/lib/http2.c
index 9380ca7cf..350642019 100644
--- a/lib/http2.c
+++ b/lib/http2.c
@@ -1178,7 +1178,8 @@ void Curl_http2_done(struct connectdata *conn, bool premature)
       httpc->pause_stream_id = 0;
     }
   }
-  if(http->stream_id) {
+  /* -1 means unassigned and 0 means cleared */
+  if(http->stream_id > 0) {
     int rv = nghttp2_session_set_stream_user_data(httpc->h2,
                                                   http->stream_id, 0);
     if(rv) {