Toomas Soome 4a2d7cee02 loader: vdev_read() can corrupt memory
When reading less than sector size but from sector boundary,
the vdev_read() will read full sector into the provided buffer
and therefore corrupting memory past buffer end.

MFC after:	2 days
2020-05-09 06:25:20 +00:00
..
2019-06-25 04:50:09 +00:00
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