From c85116940e9175243d9d5127071bfd8716bb25c8 Mon Sep 17 00:00:00 2001
From: Peter Veenstra <qbix79@users.sourceforge.net>
Date: Tue, 9 Nov 2010 08:35:57 +0000
Subject: [PATCH] ..\ is valid if the result ends up in the root dir. Thanks
 ripsaw

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3659
---
 src/dos/dos_files.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/dos/dos_files.cpp b/src/dos/dos_files.cpp
index 6ae2f439..9fe36bcb 100644
--- a/src/dos/dos_files.cpp
+++ b/src/dos/dos_files.cpp
@@ -206,11 +206,15 @@ bool DOS_ChangeDir(char const * const dir) {
 	const char * testdir=dir;
 	if (strlen(testdir) && testdir[1]==':') testdir+=2;
 	size_t len=strlen(testdir);
-	if (!len || (len>1 && testdir[len-1]=='\\')) {
+	if (!len) {
 		DOS_SetError(DOSERR_PATH_NOT_FOUND);
 		return false;
 	}
 	if (!DOS_MakeName(dir,fulldir,&drive)) return false;
+	if (strlen(fulldir) && testdir[len-1]=='\\') {
+		DOS_SetError(DOSERR_PATH_NOT_FOUND);
+		return false;
+	}
 	
 	if (Drives[drive]->TestDir(fulldir)) {
 		strcpy(Drives[drive]->curdir,fulldir);