X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Ftcp%2Ftcp_input.c;h=e0139a47e0ce78f7c3155d0df29e9258ce40ba6c;hb=282a3cb7265346e1299c9401b35730b80f4b506b;hp=492703149243b1285dbdc0d2762a4625f5ab2443;hpb=7c22ff72aa54d15484fdc70e0c1b8a9ec5e880e0;p=vpp.git

diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index 49270314924..e0139a47e0c 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -411,7 +411,8 @@ tcp_rcv_ack_no_cc (tcp_connection_t * tc, vlib_buffer_t * b, u32 * error)
   if (!(seq_leq (tc->snd_una, vnet_buffer (b)->tcp.ack_number)
 	&& seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)))
     {
-      if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_una_max))
+      if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_una_max)
+	  && seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una))
 	{
 	  tc->snd_nxt = vnet_buffer (b)->tcp.ack_number;
 	  goto acceptable;
@@ -1580,7 +1581,8 @@ tcp_rcv_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b,
     {
       /* We've probably entered recovery and the peer still has some
        * of the data we've sent. Update snd_nxt and accept the ack */
-      if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_una_max))
+      if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_una_max)
+	  && seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una))
 	{
 	  tc->snd_nxt = vnet_buffer (b)->tcp.ack_number;
 	  goto process_ack;