From 4f67db8dd732efbace81aa57260b6575fe86dd55 Mon Sep 17 00:00:00 2001
From: Alex James <git@alextjam.es>
Date: Mon, 14 Aug 2023 19:49:10 -0500
Subject: [PATCH] libaegisub: Avoid calling iconv_close(iconv_invalid)

IsConversionSupported unconditionally calls iconv_close on the
descriptor returned by iconv_open. This may result in crashes if
iconv_open returns iconv_invalid.
---
 libaegisub/common/charset_conv.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libaegisub/common/charset_conv.cpp b/libaegisub/common/charset_conv.cpp
index 47644eb1c..f19090c15 100644
--- a/libaegisub/common/charset_conv.cpp
+++ b/libaegisub/common/charset_conv.cpp
@@ -420,7 +420,7 @@ size_t IconvWrapper::DstStrLen(const char* str) {
 bool IsConversionSupported(const char *src, const char *dst) {
 	iconv_t cd = iconv_open(dst, src);
 	bool supported = cd != iconv_invalid;
-	iconv_close(cd);
+	if (supported) iconv_close(cd);
 	return supported;
 }