QImage.bits returns buffer which does not retain QImage (potential segfault)

QImage.bits() returns a buffer object (yay!) which I would like to use for qimage2ndarray. However, the lifetime of the QImage is not bound to the buffer, i.e. the buffer does not hold a reference to it.

That means that it is easy to produce a crash, e.g. like this:

In [1]: filename = ...

In [2]: from PySide import QtGui

In [3]: image = QtGui.QImage(filename)

In [4]: isinstance(image.bits(), buffer)
Out[4]: True

In [5]: import numpy

In [6]: a = numpy.ndarray((image.height(), image.width()), numpy.uint32, image.bits(), 0, (image.bytesPerLine(), image.depth() / 8), 'C')

In [7]: numpy.all(a[:] > 0)
Out[7]: True

In [8]: del image

In [9]: a[:]
zsh: segmentation fault (core dumped) python =ipython

(I am attaching the input lines as .py file, too.)