From 1b1e15623a3b774f251a53ae74e834763abf41e7 Mon Sep 17 00:00:00 2001
From: Giuliano <3684609+GMagician@users.noreply.github.com>
Date: Sun, 10 Jun 2018 05:03:57 +0200
Subject: [PATCH] [1.1.x] Fix null check in lsDive (#10979)
---
Marlin/cardreader.cpp | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/Marlin/cardreader.cpp b/Marlin/cardreader.cpp
index 146f6ca035..c8c1740fa5 100644
--- a/Marlin/cardreader.cpp
+++ b/Marlin/cardreader.cpp
@@ -98,8 +98,8 @@ void CardReader::lsDive(const char *prepend, SdFile parent, const char * const m
createFilename(dosFilename, p);
// Allocate enough stack space for the full path to a folder, trailing slash, and nul
- bool prepend_is_empty = (prepend[0] == '\0');
- int len = (prepend_is_empty ? 1 : strlen(prepend)) + strlen(dosFilename) + 1 + 1;
+ const bool prepend_is_empty = (!prepend || prepend[0] == '\0');
+ const int len = (prepend_is_empty ? 1 : strlen(prepend)) + strlen(dosFilename) + 1 + 1;
char path[len];
// Append the FOLDERNAME12/ to the passed string.