1 files changed, 4 insertions, 0 deletions

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 32061928b054..0c4ed66dc1bf 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -3247,7 +3247,11 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst,
                 skb->skb_mstamp_ns = cookie_init_timestamp(req);
         else
 #endif
+        {
                 skb->skb_mstamp_ns = tcp_clock_ns();
+                if (!tcp_rsk(req)->snt_synack) /* Timestamp first SYNACK */
+                        tcp_rsk(req)->snt_synack = tcp_skb_timestamp_us(skb);
+        }
 
 #ifdef CONFIG_TCP_MD5SIG
         rcu_read_lock();