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-rw-r--r--ecp/src/rbuf_recv.c5
1 files changed, 4 insertions, 1 deletions
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;
}