# HG changeset patch
# User Vladimir Homutov <vl@nginx.com>
# Date 1603746864 -10800
# Node ID b1676cd64dc90a5960baceba9981d439c9b54168
# Parent  e2086d8181fab3e98eadfc7ed3a780467f606a40
QUIC: cleanup send context properly.

The patch resets ctx->frames queue, which may contain frames.  It was possible
that congestion or amplification limits prevented all frames to be sent.

Retransmitted frames could be accounted twice as inflight: first time in
ngx_quic_congestion_lost() called from ngx_quic_resend_frames(), and later
from ngx_quic_discard_ctx().

diff --git a/src/event/ngx_event_quic.c b/src/event/ngx_event_quic.c
--- a/src/event/ngx_event_quic.c
+++ b/src/event/ngx_event_quic.c
@@ -2254,6 +2254,15 @@ ngx_quic_discard_ctx(ngx_connection_t *c
         ngx_quic_free_frame(c, f);
     }
 
+    while (!ngx_queue_empty(&ctx->frames)) {
+        q = ngx_queue_head(&ctx->frames);
+        ngx_queue_remove(q);
+
+        f = ngx_queue_data(q, ngx_quic_frame_t, queue);
+        ngx_quic_congestion_ack(c, f);
+        ngx_quic_free_frame(c, f);
+    }
+
     ctx->send_ack = 0;
 }
 
@@ -5677,6 +5686,7 @@ ngx_quic_congestion_lost(ngx_connection_
     cg = &qc->congestion;
 
     cg->in_flight -= f->plen;
+    f->plen = 0;
 
     timer = f->last - cg->recovery_start;