From 4e359f955200593641b0b415dba27050fc0619f7 Mon Sep 17 00:00:00 2001
From: Jacob Dahl <37091262+dakejahl@users.noreply.github.com>
Date: Mon, 30 Sep 2024 11:22:46 -0800
Subject: [PATCH] set file descriptor to -1 after close() (#23751)

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

diff --git a/src/drivers/cdcacm_autostart/cdcacm_autostart.cpp b/src/drivers/cdcacm_autostart/cdcacm_autostart.cpp
index 3c963e7988..d86788ff7f 100644
--- a/src/drivers/cdcacm_autostart/cdcacm_autostart.cpp
+++ b/src/drivers/cdcacm_autostart/cdcacm_autostart.cpp
@@ -76,6 +76,7 @@ CdcAcmAutostart::~CdcAcmAutostart()
 
 	if (_ttyacm_fd >= 0) {
 		px4_close(_ttyacm_fd);
+		_ttyacm_fd = -1;
 	}
 
 	ScheduleClear();
@@ -344,6 +345,7 @@ void CdcAcmAutostart::state_disconnecting()
 
 	if (_ttyacm_fd > 0) {
 		px4_close(_ttyacm_fd);
+		_ttyacm_fd = -1;
 	}
 
 	// Disconnect serial