1 files changed, 2 insertions, 1 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 7c1a92ffa083..4268cd13ff9a 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1160,7 +1160,8 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
         int first_sack_index;
 
         if (!tp->sacked_out) {
-                tp->fackets_out = 0;
+                if (WARN_ON(tp->fackets_out))
+                        tp->fackets_out = 0;
                 tp->highest_sack = tp->snd_una;
         }
         prior_fackets = tp->fackets_out;