http2: Stop drain from being permanently set on

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

diff --git a/lib/http2.c b/lib/http2.c
index 0c5f6db..0c8b59d 100644 (file)
--- 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,