VMABuffer::set_data was a publicly accessible safe function. It accepted an arbitrary offset and a data slice, then used the offset in unsafe pointer arithmetic before copying the slice into a mapped allocation.
Affected versions did not check that the requested write range fit within the allocation before calling ptr.add(offset) and copy_from_nonoverlapping. Safe Rust code could therefore trigger an out-of-bounds write by passing an offset outside the mapped allocation.
This makes the safe API unsound, since callers can trigger undefined behavior without using unsafe.
Version 0.4.0 added a bounds check before performing the pointer arithmetic and copy.
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