Slice bounds out of range bug

[Kleissner]

The code uses d.Bsize without checking if it's within the range of the slice d.NameBts. A specially crafted ole2 file (Excel sheet) can crash the application by setting a a high number for d.Bsize.

ole2/dir.go

Lines 32 to 35 in d694296

	func (d *File) Name() string {
	runes := utf16.Decode(d.NameBts[:d.Bsize/2-1])
	return string(runes)
	}

The fix is to check the ranges first.