static int check_line_charstring(void)
{
  char *p = line;
  while (isspace(*p))
    p++;
  return (*p == '/' || (p[0] == 'd' && p[1] == 'u' && p[2] == 'p'));
}
The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.