1 files changed, 4 insertions, 0 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 8116d06e042c..53c8ce4046b2 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1403,6 +1403,10 @@ static int tcp_shifted_skb(struct sock *sk, struct sk_buff *skb,
 
         BUG_ON(!pcount);
 
+        /* Adjust hint for FACK. Non-FACK is handled in tcp_sacktag_one(). */
+        if (tcp_is_fack(tp) && (skb == tp->lost_skb_hint))
+                tp->lost_cnt_hint += pcount;
+
         TCP_SKB_CB(prev)->end_seq += shifted;
         TCP_SKB_CB(skb)->seq += shifted;