diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c
index 2f191e50d4fc..51f2409d6113 100644
--- a/net/kcm/kcmsock.c
+++ b/net/kcm/kcmsock.c
@@ -748,7 +748,7 @@ static int kcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
 {
 	struct sock *sk = sock->sk;
 	struct kcm_sock *kcm = kcm_sk(sk);
-	struct sk_buff *skb = NULL, *head = NULL;
+	struct sk_buff *skb = NULL, *head = NULL, *seq_skb;
 	size_t copy, copied = 0;
 	long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
 	int eor = (sock->type == SOCK_DGRAM) ?
@@ -763,6 +763,7 @@ static int kcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
 	if (sk->sk_err)
 		goto out_error;
 
+	seq_skb = kcm->seq_skb;
 	if (kcm->seq_skb) {
 		/* Previously opened message */
 		head = kcm->seq_skb;
@@ -888,6 +889,8 @@ static int kcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
 		err = sk_stream_wait_memory(sk, &timeo);
 		if (err)
 			goto out_error;
+		if (seq_skb && seq_skb != kcm->seq_skb)
+			goto out_stolen;
 	}
 
 	if (eor) {
@@ -943,7 +946,7 @@ static int kcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
 		kfree_skb(head);
 		kcm->seq_skb = NULL;
 	}
-
+out_stolen:
 	err = sk_stream_error(sk, msg->msg_flags, err);
 
 	/* make sure we wake any epoll edge trigger waiter */