X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Ftcp%2Ftcp_input.c;h=5ec4099fa4633556a1affd4ed63165debdb03ef5;hb=607ece36b6f0fc6fe1122db58f2eb7d3713f34cc;hp=398bf1b76a7c4854485e0972f2c5ae961217d81e;hpb=646984080358df8091c4fb10890a033777d90e4c;p=vpp.git

diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index 398bf1b76a7..5ec4099fa46 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -1187,7 +1187,7 @@ tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b,
     }
 
   /* Update SACK list if need be */
-  if (tcp_opts_sack_permitted (&tc->rcv_opts))
+  if (tcp_opts_sack_permitted (&tc->rcv_opts) && vec_len (tc->snd_sacks))
     {
       /* Remove SACK blocks that have been delivered */
       tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt);