diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 8ffb8aabd324..42c58e0c557c 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -2805,30 +2805,16 @@ static void __mptcp_wr_shutdown(struct sock *sk) static void __mptcp_destroy_sock(struct sock *sk) { - struct mptcp_subflow_context *subflow, *tmp; struct mptcp_sock *msk = mptcp_sk(sk); - LIST_HEAD(conn_list); pr_debug("msk=%p", msk); might_sleep(); - /* join list will be eventually flushed (with rst) at sock lock release time*/ - list_splice_init(&msk->conn_list, &conn_list); - mptcp_stop_timer(sk); sk_stop_timer(sk, &sk->sk_timer); msk->pm.status = 0; - /* clears msk->subflow, allowing the following loop to close - * even the initial subflow - */ - mptcp_dispose_initial_subflow(msk); - list_for_each_entry_safe(subflow, tmp, &conn_list, node) { - struct sock *ssk = mptcp_subflow_tcp_sock(subflow); - __mptcp_close_ssk(sk, ssk, subflow, 0); - } - sk->sk_prot->destroy(sk); WARN_ON_ONCE(msk->rmem_fwd_alloc); @@ -2920,24 +2906,20 @@ static void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk) static int mptcp_disconnect(struct sock *sk, int flags) { - struct mptcp_subflow_context *subflow, *tmp; struct mptcp_sock *msk = mptcp_sk(sk); inet_sk_state_store(sk, TCP_CLOSE); - list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) { - struct sock *ssk = mptcp_subflow_tcp_sock(subflow); - - __mptcp_close_ssk(sk, ssk, subflow, MPTCP_CF_FASTCLOSE); - } - mptcp_stop_timer(sk); sk_stop_timer(sk, &sk->sk_timer); if (mptcp_sk(sk)->token) mptcp_event(MPTCP_EVENT_CLOSED, mptcp_sk(sk), NULL, GFP_KERNEL); - mptcp_destroy_common(msk); + /* msk->subflow is still intact, the following will not free the first + * subflow + */ + mptcp_destroy_common(msk, MPTCP_CF_FASTCLOSE); msk->last_snd = NULL; WRITE_ONCE(msk->flags, 0); msk->cb_flags = 0; @@ -3087,12 +3069,17 @@ out: return newsk; } -void mptcp_destroy_common(struct mptcp_sock *msk) +void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags) { + struct mptcp_subflow_context *subflow, *tmp; struct sock *sk = (struct sock *)msk; __mptcp_clear_xmit(sk); + /* join list will be eventually flushed (with rst) at sock lock release time */ + list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) + __mptcp_close_ssk(sk, mptcp_subflow_tcp_sock(subflow), subflow, flags); + /* move to sk_receive_queue, sk_stream_kill_queues will purge it */ mptcp_data_lock(sk); skb_queue_splice_tail_init(&msk->receive_queue, &sk->sk_receive_queue); @@ -3114,7 +3101,11 @@ static void mptcp_destroy(struct sock *sk) { struct mptcp_sock *msk = mptcp_sk(sk); - mptcp_destroy_common(msk); + /* clears msk->subflow, allowing the following to close + * even the initial subflow + */ + mptcp_dispose_initial_subflow(msk); + mptcp_destroy_common(msk, 0); sk_sockets_allocated_dec(sk); } diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 480c5320b86e..78c8c471b22e 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -718,7 +718,7 @@ static inline void mptcp_write_space(struct sock *sk) } } -void mptcp_destroy_common(struct mptcp_sock *msk); +void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); #define MPTCP_TOKEN_MAX_RETRIES 4 diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c index af28f3b60389..ac41b55b0a81 100644 --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -621,7 +621,8 @@ static void mptcp_sock_destruct(struct sock *sk) sock_orphan(sk); } - mptcp_destroy_common(mptcp_sk(sk)); + /* We don't need to clear msk->subflow, as it's still NULL at this point */ + mptcp_destroy_common(mptcp_sk(sk), 0); inet_sock_destruct(sk); }