From 59ae7d94ea7c837c2869edcb577d9ae5e204ab0e Mon Sep 17 00:00:00 2001
From: Andreas Mohr <a.mohr@mailto.de>
Date: Mon, 7 Dec 1998 10:56:40 +0000
Subject: [PATCH] Fixed a heap bug.

---
 multimedia/mmsystem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/multimedia/mmsystem.c b/multimedia/mmsystem.c
index 2cc03610d1e..3e5eb08a767 100644
--- a/multimedia/mmsystem.c
+++ b/multimedia/mmsystem.c
@@ -2062,7 +2062,7 @@ int	MCI_UnMapMsg16To32A(WORD uDevTyp, WORD wMsg, DWORD lParam)
 	    
 	    mop16->wDeviceID = mop32a->wDeviceID;
 	}
-	HeapFree(SystemHeap, 0, (LPVOID)lParam);
+	HeapFree(SystemHeap, 0, (LPVOID)(lParam - sizeof(LPMCI_OPEN_PARMS16)));
 	return 0;
     default:
 	FIXME(mci, "Map/Unmap internal error on msg=%s\n", MCI_CommandToString(wMsg));
-- 
2.11.4.GIT