From ff793da7d320eb6b35f223f57d6dabc5d9685354 Mon Sep 17 00:00:00 2001
From: Christopher Williams <abbrev@gmail.com>
Date: Tue, 4 Sep 2018 17:29:56 -0700
Subject: [PATCH] R0.13b patch 3

Sep 3, 2018

f_getcwd function uses memory location beyond the output buffer length specified by argument if
the buffer has a valid drive number. It can collapse the data located next to the output buffer.
This problem was reported via email.
---
 source/ff.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/source/ff.c b/source/ff.c
index 4293e38..a818543 100644
--- a/source/ff.c
+++ b/source/ff.c
@@ -4145,6 +4145,7 @@ FRESULT f_getcwd (
 
 
 	/* Get logical drive */
+	buff[0] = 0;	/* Set null string to get current volume */
 	res = find_volume((const TCHAR**)&buff, &fs, 0);	/* Get current volume */
 	if (res == FR_OK) {
 		dj.obj.fs = fs;