From f84f7e5a382b37c75e37f9d76f86fff94e936f37 Mon Sep 17 00:00:00 2001
From: Adrian Cuzman <adriancuzman@users.noreply.github.com>
Date: Wed, 28 Mar 2018 20:43:41 +0200
Subject: [PATCH] Require a checksum when writing to SD (#10204)

When streaming commands to SD with XON/XOFF, errors can occur and cause incomplete commands to be written to the file. This change ensures that only commands with line numbers and checksum will be saved to SD.
---
 Marlin/Marlin_main.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 1f6a826d29..5e9945c7a1 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -1070,6 +1070,10 @@ inline void get_serial_commands() {
 
         gcode_LastN = gcode_N;
       }
+      else if (card.saving) {
+        gcode_line_error(PSTR(MSG_ERR_NO_CHECKSUM));
+        return;
+      }
 
       // Movement commands alert when stopped
       if (IsStopped()) {