From 299606e4ae7b896d1febc2f45cfafb5e7958bc99 Mon Sep 17 00:00:00 2001
From: GMagician <3684609+GMagician@users.noreply.github.com>
Date: Sat, 10 Feb 2018 21:14:34 +0100
Subject: [PATCH] [2.0.x] Memory overflow protection (#9562)

---
 Marlin/src/lcd/ultralcd.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Marlin/src/lcd/ultralcd.cpp b/Marlin/src/lcd/ultralcd.cpp
index d5b439e904..220955c81a 100644
--- a/Marlin/src/lcd/ultralcd.cpp
+++ b/Marlin/src/lcd/ultralcd.cpp
@@ -92,7 +92,7 @@ uint8_t lcd_status_update_delay = 1, // First update one loop delayed
         lcd_status_message_level;    // Higher level blocks lower level
 
 #if ENABLED(STATUS_MESSAGE_SCROLLING)
-  #define MAX_MESSAGE_LENGTH max(2 * CHARSIZE * LCD_WIDTH, LONG_FILENAME_LENGTH)
+  #define MAX_MESSAGE_LENGTH max(CHARSIZE * 2 * (LCD_WIDTH), LONG_FILENAME_LENGTH)
   uint8_t status_scroll_pos = 0;
 #else
   #define MAX_MESSAGE_LENGTH CHARSIZE * (LCD_WIDTH)
@@ -5218,7 +5218,7 @@ bool lcd_hasstatus() { return (lcd_status_message[0] != '\0'); }
 
 void lcd_setstatus(const char * const message, const bool persist) {
   if (lcd_status_message_level > 0) return;
-  strncpy(lcd_status_message, message, 3 * (LCD_WIDTH));
+  strncpy(lcd_status_message, message, COUNT(lcd_status_message) - 1);
   lcd_finishstatus(persist);
 }
 
@@ -5226,7 +5226,7 @@ void lcd_setstatusPGM(const char * const message, int8_t level) {
   if (level < 0) level = lcd_status_message_level = 0;
   if (level < lcd_status_message_level) return;
   lcd_status_message_level = level;
-  strncpy_P(lcd_status_message, message, 3 * (LCD_WIDTH));
+  strncpy_P(lcd_status_message, message, COUNT(lcd_status_message) - 1);
   lcd_finishstatus(level > 0);
 }
 
@@ -5235,7 +5235,7 @@ void lcd_status_printf_P(const uint8_t level, const char * const fmt, ...) {
   lcd_status_message_level = level;
   va_list args;
   va_start(args, fmt);
-  vsnprintf_P(lcd_status_message, 3 * (LCD_WIDTH), fmt, args);
+  vsnprintf_P(lcd_status_message, COUNT(lcd_status_message) - 1, fmt, args);
   va_end(args);
   lcd_finishstatus(level > 0);
 }