parallels: Sanity check for s->tracks (CVE-2014-0142)
This avoids a possible division by zero. Convert s->tracks to unsigned as well because it feels better than surviving just because the results of calculations with s->tracks are converted to unsigned anyway. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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