diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
index 68eec0672743..0ab37f31eee9 100644
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -341,6 +341,35 @@ int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info)
 	return err;
 }
 
+static int userspace_pm_subflow_create(struct mptcp_sock *msk,
+				       struct mptcp_pm_addr_entry *local,
+				       struct mptcp_addr_info *remote)
+{
+	struct sock *sk = (struct sock *)msk;
+	int err;
+
+	if (local->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)
+		return -EINVAL;
+	local->flags |= MPTCP_PM_ADDR_FLAG_SUBFLOW;
+
+	if (!mptcp_pm_addr_families_match(sk, &local->addr, remote))
+		return -EINVAL;
+
+	err = mptcp_userspace_pm_append_new_local_addr(msk, local, false);
+	if (err < 0)
+		return err;
+
+	err = __mptcp_subflow_connect(sk, local, remote);
+	spin_lock_bh(&msk->pm.lock);
+	if (err)
+		mptcp_userspace_pm_delete_local_addr(msk, local);
+	else
+		msk->pm.subflows++;
+	spin_unlock_bh(&msk->pm.lock);
+
+	return err;
+}
+
 int mptcp_pm_nl_subflow_create_doit(struct sk_buff *skb, struct genl_info *info)
 {
 	struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
@@ -368,41 +397,17 @@ int mptcp_pm_nl_subflow_create_doit(struct sk_buff *skb, struct genl_info *info)
 		goto create_err;
 	}
 
-	if (entry.flags & MPTCP_PM_ADDR_FLAG_SIGNAL) {
-		GENL_SET_ERR_MSG(info, "invalid addr flags");
-		err = -EINVAL;
-		goto create_err;
-	}
-	entry.flags |= MPTCP_PM_ADDR_FLAG_SUBFLOW;
-
 	err = mptcp_pm_parse_addr(raddr, info, &addr_r);
 	if (err < 0) {
 		NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr");
 		goto create_err;
 	}
 
-	if (!mptcp_pm_addr_families_match(sk, &entry.addr, &addr_r)) {
-		GENL_SET_ERR_MSG(info, "families mismatch");
-		err = -EINVAL;
-		goto create_err;
-	}
-
-	err = mptcp_userspace_pm_append_new_local_addr(msk, &entry, false);
-	if (err < 0) {
-		GENL_SET_ERR_MSG(info, "did not match address and id");
-		goto create_err;
-	}
-
 	lock_sock(sk);
-	err = __mptcp_subflow_connect(sk, &entry, &addr_r);
+	err = userspace_pm_subflow_create(msk, &entry, &addr_r);
 	release_sock(sk);
-
-	spin_lock_bh(&msk->pm.lock);
 	if (err)
-		mptcp_userspace_pm_delete_local_addr(msk, &entry);
-	else
-		msk->pm.subflows++;
-	spin_unlock_bh(&msk->pm.lock);
+		GENL_SET_ERR_MSG(info, "subflow_create failed");
 
  create_err:
 	sock_put(sk);
@@ -457,6 +462,46 @@ static struct sock *mptcp_nl_find_ssk(struct mptcp_sock *msk,
 	return NULL;
 }
 
+static int userspace_pm_subflow_destroy(struct mptcp_sock *msk,
+					struct mptcp_pm_addr_entry *local,
+					struct mptcp_addr_info *remote)
+{
+	struct sock *sk = (struct sock *)msk;
+	struct sock *ssk;
+	int err = -ESRCH;
+
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+	if (local->addr.family == AF_INET && ipv6_addr_v4mapped(&remote->addr6)) {
+		ipv6_addr_set_v4mapped(local->addr.addr.s_addr, &remote->addr6);
+		local->addr.family = AF_INET6;
+	}
+	if (remote->family == AF_INET && ipv6_addr_v4mapped(&local->addr.addr6)) {
+		ipv6_addr_set_v4mapped(remote->addr.s_addr, &local->addr.addr6);
+		remote->family = AF_INET6;
+	}
+#endif
+	if (local->addr.family != remote->family)
+		return -EINVAL;
+
+	if (!local->addr.port || !remote->port)
+		return -EINVAL;
+
+	ssk = mptcp_nl_find_ssk(msk, &local->addr, remote);
+	if (ssk) {
+		struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
+
+		spin_lock_bh(&msk->pm.lock);
+		mptcp_userspace_pm_delete_local_addr(msk, local);
+		spin_unlock_bh(&msk->pm.lock);
+		mptcp_subflow_shutdown(sk, ssk, RCV_SHUTDOWN | SEND_SHUTDOWN);
+		mptcp_close_ssk(sk, ssk, subflow);
+		MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RMSUBFLOW);
+		err = 0;
+	}
+
+	return err;
+}
+
 int mptcp_pm_nl_subflow_destroy_doit(struct sk_buff *skb, struct genl_info *info)
 {
 	struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
@@ -464,8 +509,8 @@ int mptcp_pm_nl_subflow_destroy_doit(struct sk_buff *skb, struct genl_info *info
 	struct mptcp_pm_addr_entry local;
 	struct mptcp_addr_info addr_r;
 	struct mptcp_sock *msk;
-	struct sock *sk, *ssk;
 	int err = -EINVAL;
+	struct sock *sk;
 
 	if (!laddr || !raddr) {
 		GENL_SET_ERR_MSG(info, "missing required inputs");
@@ -490,44 +535,11 @@ int mptcp_pm_nl_subflow_destroy_doit(struct sk_buff *skb, struct genl_info *info
 		goto destroy_err;
 	}
 
-#if IS_ENABLED(CONFIG_MPTCP_IPV6)
-	if (local.addr.family == AF_INET && ipv6_addr_v4mapped(&addr_r.addr6)) {
-		ipv6_addr_set_v4mapped(local.addr.addr.s_addr, &local.addr.addr6);
-		local.addr.family = AF_INET6;
-	}
-	if (addr_r.family == AF_INET && ipv6_addr_v4mapped(&local.addr.addr6)) {
-		ipv6_addr_set_v4mapped(addr_r.addr.s_addr, &local.addr.addr6);
-		addr_r.family = AF_INET6;
-	}
-#endif
-	if (local.addr.family != addr_r.family) {
-		GENL_SET_ERR_MSG(info, "address families do not match");
-		err = -EINVAL;
-		goto destroy_err;
-	}
-
-	if (!local.addr.port || !addr_r.port) {
-		GENL_SET_ERR_MSG(info, "missing local or remote port");
-		err = -EINVAL;
-		goto destroy_err;
-	}
-
 	lock_sock(sk);
-	ssk = mptcp_nl_find_ssk(msk, &local.addr, &addr_r);
-	if (ssk) {
-		struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
-
-		spin_lock_bh(&msk->pm.lock);
-		mptcp_userspace_pm_delete_local_addr(msk, &local);
-		spin_unlock_bh(&msk->pm.lock);
-		mptcp_subflow_shutdown(sk, ssk, RCV_SHUTDOWN | SEND_SHUTDOWN);
-		mptcp_close_ssk(sk, ssk, subflow);
-		MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RMSUBFLOW);
-		err = 0;
-	} else {
-		err = -ESRCH;
-	}
+	err = userspace_pm_subflow_destroy(msk, &local, &addr_r);
 	release_sock(sk);
+	if (err)
+		GENL_SET_ERR_MSG(info, "subflow_destroy failed");
 
 destroy_err:
 	sock_put(sk);
