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Fix race between outbound messages and peer disconnection #2663

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Oct 18, 2023
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Fix race between outbound messages and peer disconnection #2663

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10 changes: 4 additions & 6 deletions lightning/src/ln/peer_handler.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1870,15 +1870,13 @@ impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CM
let flush_read_disabled = self.gossip_processing_backlog_lifted.swap(false, Ordering::Relaxed);

let mut peers_to_disconnect = HashMap::new();
let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
events_generated.append(&mut self.message_handler.route_handler.get_and_clear_pending_msg_events());

{
// TODO: There are some DoS attacks here where you can flood someone's outbound send
// buffer by doing things like announcing channels on another node. We should be willing to
// drop optional-ish messages when send buffers get full!

let peers_lock = self.peers.read().unwrap();

let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
events_generated.append(&mut self.message_handler.route_handler.get_and_clear_pending_msg_events());

let peers = &*peers_lock;
macro_rules! get_peer_for_forwarding {
($node_id: expr) => {
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