bochs: Check extent_size header field (CVE-2014-0142)
This fixes two possible division by zero crashes: In bochs_open() and in seek_to_sector(). Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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