Channel.prototype._read = function(n) {
  if (this._waitChanDrain) {
    this._waitChanDrain = false;
    if (this.incoming.window <= WINDOW_THRESHOLD)
      windowAdjust(this);
  }
};
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.