QUIC: prevent deleted stream frame retransmissions.

Since a2a513b93cae, stream frames no longer need to be retransmitted after it
was deleted.  The frames which were retransmitted before, could be stream data
frames sent prior to a RESET_STREAM. Such retransmissions are explicitly
prohibited by RFC 9000, Section 19.4.

diff --git a/src/event/quic/ngx_event_quic_ack.c b/src/event/quic/ngx_event_quic_ack.c
index c7ffd44dd77e9c9ce8243c394296911deceafd05..c953b8042ec621d0bfb1f5f15d1db5068b081d18 100644 (file)
--- a/src/event/quic/ngx_event_quic_ack.c
+++ b/src/event/quic/ngx_event_quic_ack.c
@@ -631,13 +631,12 @@ ngx_quic_resend_frames(ngx_connection_t *c, ngx_quic_send_ctx_t *ctx)
         case NGX_QUIC_FT_STREAM:
             qs = ngx_quic_find_stream(&qc->streams.tree, f->u.stream.stream_id);
 
-            if (qs) {
-                if (qs->send_state == NGX_QUIC_STREAM_SEND_RESET_SENT
-                    || qs->send_state == NGX_QUIC_STREAM_SEND_RESET_RECVD)
-                {
-                    ngx_quic_free_frame(c, f);
-                    break;
-                }
+            if (qs == NULL
+                || qs->send_state == NGX_QUIC_STREAM_SEND_RESET_SENT
+                || qs->send_state == NGX_QUIC_STREAM_SEND_RESET_RECVD)
+            {
+                ngx_quic_free_frame(c, f);
+                break;
             }
 
             /* fall through */