# HG changeset patch
# User Roman Arutyunyan <arut@nginx.com>
# Date 1584966744 -10800
# Node ID 159eb325ec82390e0449d58d824545798f58b7db
# Parent  a8349cc72c64c8c3de40ea55ef3f5c9776930065
Put zero in 'First ACK Range' when acknowledging one packet.

This fixes Chrome CONNECTION_ID_LIMIT_ERROR with the reason:
"Underflow with first ack block length 2 largest acked is 1".

diff --git a/src/event/ngx_event_quic_transport.c b/src/event/ngx_event_quic_transport.c
--- a/src/event/ngx_event_quic_transport.c
+++ b/src/event/ngx_event_quic_transport.c
@@ -1104,7 +1104,7 @@ ngx_quic_create_ack(u_char *p, ngx_quic_
         len += ngx_quic_varint_len(ack->pn);
         len += ngx_quic_varint_len(0);
         len += ngx_quic_varint_len(0);
-        len += ngx_quic_varint_len(ack->pn);
+        len += ngx_quic_varint_len(0);
 
         return len;
     }
@@ -1115,7 +1115,7 @@ ngx_quic_create_ack(u_char *p, ngx_quic_
     ngx_quic_build_int(&p, ack->pn);
     ngx_quic_build_int(&p, 0);
     ngx_quic_build_int(&p, 0);
-    ngx_quic_build_int(&p, ack->pn);
+    ngx_quic_build_int(&p, 0);
 
     return p - start;
 }