Floppy ioctl range clamping fixes

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Hmm. I just realized when I saw Sasha's autoselect patches flying by
that the floppy ioctl fixes didn't get marked for stable, but they
probably should be.

There's four commits:

  da99466ac243 floppy: fix out-of-bounds read in copy_buffer
  9b04609b7840 floppy: fix invalid pointer dereference in drive_name
  5635f897ed83 floppy: fix out-of-bounds read in next_valid_format
  f3554aeb9912 floppy: fix div-by-zero in setup_format_params

that look like stable material - even if I sincerely hope that the
floppy driver isn't critical for anybody.

I leave it to the stable people to decide if they care. I don't think
the hardware matters any more, but I could imagine that people still
use it for some virtual images and have a floppy device inside a VM
for that reason.

                Linus



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