1 files changed, 3 insertions, 2 deletions

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index a3e60cc04a8a..acd32e3f1b68 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -403,8 +403,9 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
                 tp->mtu_info = ntohl(info);
                 if (!sock_owned_by_user(sk))
                         tcp_v6_mtu_reduced(sk);
-                else
-                        set_bit(TCP_MTU_REDUCED_DEFERRED, &tp->tsq_flags);
+                else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED,
+                                           &tp->tsq_flags))
+                        sock_hold(sk);
                 goto out;
         }