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From 19ebb61bf92262dc1868de10ba5a211db249ce76 Mon Sep 17 00:00:00 2001
From: Stas'M <x86corez@gmail.com>
Date: Thu, 4 Oct 2018 00:18:32 +0300
Subject: [PATCH] FMOPL: Avoid double-free by checking OPL pointer (fix #67)
Fixes CVE-2018-17825.
---
src/fmopl.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/fmopl.c b/src/fmopl.c
index 0cd1d69..1c4485e 100644
--- a/src/fmopl.c
+++ b/src/fmopl.c
@@ -1269,6 +1269,10 @@ FM_OPL *OPLCreate(int type, int clock, int rate)
/* ---------- Destroy one of vietual YM3812 ---------- */
void OPLDestroy(FM_OPL *OPL)
{
+ if(!OPL)
+ {
+ return;
+ }
#ifdef OPL_OUTPUT_LOG
if(opl_dbg_fp)
{
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