GfxState *GfxState::restore() {
  GfxState *oldState;

  if (saved) {
    oldState = saved;

    oldState->path = path;
    oldState->curX = curX;
    oldState->curY = curY;
    oldState->lineX = lineX;
    oldState->lineY = lineY;

    path = NULL;
    saved = NULL;
    delete this;

  } else {
    oldState = this;
  }

  return oldState;
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.