http2: Stop drain from being permanently set onsubmit/tizen_base/20190924.062848accepted/tizen/base/20190929.221333

Various functions called within Curl_http2_done() can have the
side-effect of setting the Easy connection into drain mode (by calling
drain_this()).  However, the last time we unset this for a transfer (by
calling drained_transfer()) is at the beginning of Curl_http2_done().
If the Curl_easy is reused for another transfer, it is then stuck in
drain mode permanently, which in practice makes it unable to write any
data in the new transfer.

This fix moves the last call to drained_transfer() to later in
Curl_http2_done(), after the functions that could potentially call for a
drain.

Fixes #3966
Reported-by: Josie-H

Change-Id: I83ee02bf9017c9aa3d27d50580a0f89b8ec1d05d

1 files changed, 4 insertions, 3 deletions

diff --git a/lib/http2.c b/lib/http2.c
index 0c5f6db0b..0c8b59d1a 100644
--- a/lib/http2.c
+++ b/lib/http2.c
@@ -1163,9 +1163,6 @@ void Curl_http2_done(struct connectdata *conn, bool premature)
   if(!httpc->h2) /* not HTTP/2 ? */
     return;
 
-  if(data->state.drain)
-    drained_transfer(data, httpc);
-
   if(premature) {
     /* RST_STREAM */
     if(!nghttp2_submit_rst_stream(httpc->h2, NGHTTP2_FLAG_NONE,
@@ -1177,6 +1174,10 @@ void Curl_http2_done(struct connectdata *conn, bool premature)
       httpc->pause_stream_id = 0;
     }
   }
+
+  if(data->state.drain)
+    drained_transfer(data, httpc);
+
   /* -1 means unassigned and 0 means cleared */
   if(http->stream_id > 0) {
     int rv = nghttp2_session_set_stream_user_data(httpc->h2,