void GfxPath::close() {
  if (justMoved) {
    if (n >= size) {
      size += 16;
      subpaths = (GfxSubpath **)
	greallocn(subpaths, size, sizeof(GfxSubpath *));
    }
    subpaths[n] = new GfxSubpath(firstX, firstY);
    ++n;
    justMoved = gFalse;
  }
  subpaths[n-1]->close();
}

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