1 files changed, 2 insertions, 1 deletions

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 975f4472af29..58b7111523f4 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -965,7 +965,8 @@ static inline unsigned int tcp_cwnd_test(struct tcp_sock *tp, struct sk_buff *sk
         u32 in_flight, cwnd;
 
         /* Don't be strict about the congestion window for the final FIN.  */
-        if (TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN)
+        if ((TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN) &&
+            tcp_skb_pcount(skb) == 1)
                 return 1;
 
         in_flight = tcp_packets_in_flight(tp);