From 3bc392f5920a40c8b2b47127702eb01e07cb2096 Mon Sep 17 00:00:00 2001
From: Alex <alexander.kuntschik@uni-ulm.de>
Date: Sun, 3 Jun 2018 13:32:40 +0200
Subject: [PATCH] Prevent a buffer overflow in cardreader

---
 Marlin/cardreader.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Marlin/cardreader.cpp b/Marlin/cardreader.cpp
index 72eaa26940..146f6ca035 100644
--- a/Marlin/cardreader.cpp
+++ b/Marlin/cardreader.cpp
@@ -582,9 +582,8 @@ const char* CardReader::diveToFile(SdFile*& curDir, const char * const path, con
   while (dirname_start) {
     char * const dirname_end = strchr(dirname_start, '/');
     if (dirname_end <= dirname_start) break;
-
-    char dosSubdirname[FILENAME_LENGTH];
     const uint8_t len = dirname_end - dirname_start;
+    char dosSubdirname[len + 1];
     strncpy(dosSubdirname, dirname_start, len);
     dosSubdirname[len] = 0;