From 7cf87fa27873a954f2d665dfc61fc22227d96ad8 Mon Sep 17 00:00:00 2001 From: Parthasarathy Bhuvaragan Date: Tue, 1 Nov 2016 14:02:34 +0100 Subject: [PATCH] tipc: return early for non-blocking sockets at link congestion Until now, in stream/mcast send() we pass the message to the link layer even when the link is congested and add the socket to the link's wakeup queue. This is unnecessary for non-blocking sockets. If a socket is set to non-blocking and sends multicast with zero back off time while receiving EAGAIN, we exhaust the memory. In this commit, we return immediately at stream/mcast send() for non-blocking sockets. Acked-by: Jon Maloy Signed-off-by: Parthasarathy Bhuvaragan Signed-off-by: David S. Miller --- net/tipc/socket.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/tipc/socket.c b/net/tipc/socket.c index f9f5f3c3dab5..adf3e6ecf61e 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -697,6 +697,9 @@ static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq, uint mtu; int rc; + if (!timeo && tsk->link_cong) + return -ELINKCONG; + msg_set_type(mhdr, TIPC_MCAST_MSG); msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE); msg_set_destport(mhdr, 0); @@ -1072,6 +1075,9 @@ static int __tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz) } timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); + if (!timeo && tsk->link_cong) + return -ELINKCONG; + dnode = tsk_peer_node(tsk); skb_queue_head_init(&pktchain); -- 2.20.1