From 6fd66544880b19d2ecabe2d6bd450d3cedcfc90c Mon Sep 17 00:00:00 2001
From: Peter Keresztes Schmidt <carbenium@outlook.com>
Date: Mon, 8 Feb 2021 19:47:40 +0100
Subject: [PATCH] Monitor: Don't segfault in closeEvent if mmap is already
 unmapped

---
 src/zm_monitor.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/zm_monitor.cpp b/src/zm_monitor.cpp
index 09715e9f0..eb62b42a7 100644
--- a/src/zm_monitor.cpp
+++ b/src/zm_monitor.cpp
@@ -1022,6 +1022,8 @@ bool Monitor::disconnect() {
     close(map_fd);
 
   map_fd = -1;
+  mem_ptr = nullptr;
+  shared_data = nullptr;
 
   if ( purpose == CAPTURE ) {
     if ( unlink(mem_file) < 0 ) {
@@ -1065,8 +1067,7 @@ bool Monitor::disconnect() {
     image_buffer = nullptr;
   }
 
-  mem_ptr = nullptr;
-  shared_data = nullptr;
+
   return true;
 }  // end bool Monitor::disconnect()