From 7488be61c2b955e085659a1616262b0482bfb737 Mon Sep 17 00:00:00 2001
From: Simon Giesecke <simon.giesecke@btc-ag.com>
Date: Thu, 25 Jan 2018 15:59:57 +0100
Subject: [PATCH] Problem: add_fd might be called with fd_ == retired_fd
 Solution: add assertion

---
 src/poll.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/poll.cpp b/src/poll.cpp
index 1f9163cf..2ba5d84e 100644
--- a/src/poll.cpp
+++ b/src/poll.cpp
@@ -57,6 +57,8 @@ zmq::poll_t::~poll_t ()
 
 zmq::poll_t::handle_t zmq::poll_t::add_fd (fd_t fd_, i_poll_events *events_)
 {
+    zmq_assert (fd_ != retired_fd);
+
     //  If the file descriptor table is too small expand it.
     fd_table_t::size_type sz = fd_table.size ();
     if (sz <= (fd_table_t::size_type) fd_) {