1 files changed, 6 insertions, 1 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 4c10d9cad20f..4866e75e98e0 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1247,8 +1247,13 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
                                         NET_INC_STATS_BH(LINUX_MIB_TCPDSACKIGNOREDNOUNDO);
                                 else
                                         NET_INC_STATS_BH(LINUX_MIB_TCPDSACKIGNOREDOLD);
-                        } else
+                        } else {
+                                /* Don't count olds caused by ACK reordering */
+                                if ((TCP_SKB_CB(ack_skb)->ack_seq != tp->snd_una) &&
+                                    !after(end_seq, tp->snd_una))
+                                        continue;
                                 NET_INC_STATS_BH(LINUX_MIB_TCPSACKDISCARD);
+                        }
                         continue;
                 }