1 files changed, 2 insertions, 1 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 8aca4ee95ff9..680c4224ed96 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3484,7 +3484,8 @@ static bool tcp_process_frto(struct sock *sk, int flag)
             ((tp->frto_counter >= 2) && (flag & FLAG_RETRANS_DATA_ACKED)))
                 tp->undo_marker = 0;
 
-        if (!before(tp->snd_una, tp->frto_highmark)) {
+        if (!before(tp->snd_una, tp->frto_highmark) ||
+            !tcp_packets_in_flight(tp)) {
                 tcp_enter_frto_loss(sk, (tp->frto_counter == 1 ? 2 : 3), flag);
                 return true;
         }