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-rw-r--r--net/mptcp/options.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index ecf41d52d2fc..9486720c3256 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -695,7 +695,7 @@ static bool check_fully_established(struct mptcp_sock *msk, struct sock *sk,
if (TCP_SKB_CB(skb)->seq != subflow->ssn_offset + 1)
return subflow->mp_capable;
- if (mp_opt->use_ack) {
+ if (mp_opt->dss && mp_opt->use_ack) {
/* subflows are fully established as soon as we get any
* additional ack.
*/