From 63e0f6da6c90729a259a2fc36eabc26d18898698 Mon Sep 17 00:00:00 2001
From: Uros Majstorovic <majstor@majstor.org>
Date: Mon, 31 Jan 2022 07:55:13 +0100
Subject: fixed rbuf

---
 ecp/src/rbuf_recv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ecp/src/rbuf_recv.c b/ecp/src/rbuf_recv.c
index 98b472c..a3f2345 100644
--- a/ecp/src/rbuf_recv.c
+++ b/ecp/src/rbuf_recv.c
@@ -308,7 +308,10 @@ ssize_t ecp_rbuf_store(ECPConnection *conn, ecp_seq_t seq, unsigned char *msg, s
             if (rv < 0) return rv;
 
             buf->ack_map |= ack_bit;
-            do_ack = ack_shift(buf);
+            /* reliable transport can prevent seq_ack from reaching seq_max */
+            if (ECP_SEQ_LT(buf->seq_ack, rbuf->seq_max)) {
+                do_ack = ack_shift(buf);
+            }
         } else {
             return ECP_ERR_RBUF_DUP;
         }
-- 
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