[mojo-edk] Prevent closed port from accepting new messages

mojo/edk/system/ports/node.cc

Index: mojo/edk/system/ports/node.cc
diff --git a/mojo/edk/system/ports/node.cc b/mojo/edk/system/ports/node.cc
index 5a5d83454197d0118c13a7d46ef138e709fde9fb..75e9857731d02f163b670e8ccc6e3541f57ef60d 100644
--- a/mojo/edk/system/ports/node.cc
+++ b/mojo/edk/system/ports/node.cc
@@ -30,6 +30,8 @@ bool CanAcceptMoreMessages(const Port* port) {
   // Have we already doled out the last message (i.e., do we expect to NOT
   // receive further messages)?
   uint64_t next_sequence_num = port->message_queue.next_sequence_num();
+  if (port->state == Port::kClosed)
+    return false;
   if (port->peer_closed || port->remove_proxy_on_last_message) {
     if (port->last_sequence_num_to_receive == next_sequence_num - 1)
       return false;
@@ -821,11 +823,6 @@ int Node::AddPortWithName(const PortName& port_name,
   return OK;
 }
 
-void Node::ErasePort(const PortName& port_name) {
-  base::AutoLock lock(ports_lock_);
-  return ErasePort_Locked(port_name);
-}
-
 void Node::ErasePort_Locked(const PortName& port_name) {
   ports_lock_.AssertAcquired();
   ports_.erase(port_name);