[2.0.x] Memory overflow protection (#9562)

Marlin/src/lcd/ultralcd.cpp

         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)
 
 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);
 }
 
   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);
 }
 
   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);
 }