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    Subject[ 138/153] vhost: fix length for cross region descriptor
    3.2-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: "Michael S. Tsirkin" <mst@redhat.com>

    commit bd97120fc3d1a11f3124c7c9ba1d91f51829eb85 upstream.

    If a single descriptor crosses a region, the
    second chunk length should be decremented
    by size translated so far, instead it includes
    the full descriptor length.

    Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
    Acked-by: Jason Wang <jasowang@redhat.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    ---
    drivers/vhost/vhost.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/vhost/vhost.c
    +++ b/drivers/vhost/vhost.c
    @@ -1073,7 +1073,7 @@ static int translate_desc(struct vhost_d
    }
    _iov = iov + ret;
    size = reg->memory_size - addr + reg->guest_phys_addr;
    - _iov->iov_len = min((u64)len, size);
    + _iov->iov_len = min((u64)len - s, size);
    _iov->iov_base = (void __user *)(unsigned long)
    (reg->userspace_addr + addr - reg->guest_phys_addr);
    s += size;



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