From ee45c8ec1d75e67466cf70e9d732eea8841f9c75 Mon Sep 17 00:00:00 2001
From: Rubidium <rubidium@openttd.org>
Date: Sun, 9 Mar 2025 18:13:44 +0100
Subject: [PATCH] Codefix: do not pass invalid file descriptor to fdatasync

---
 src/ini.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/ini.cpp b/src/ini.cpp
index dc56ffd583..d13cca3cd3 100644
--- a/src/ini.cpp
+++ b/src/ini.cpp
@@ -82,6 +82,7 @@ bool IniFile::SaveToDisk(const std::string &filename)
  */
 #if defined(_POSIX_SYNCHRONIZED_IO) && _POSIX_SYNCHRONIZED_IO > 0
 	int f = open(file_new.c_str(), O_RDWR);
+	if (f < 0) return false;
 	int ret = fdatasync(f);
 	close(f);
 	if (ret != 0) return false;