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There're several reasons that the vectors need to be validated: - Return error when caller provides vectors whose num is greater than UIO_MAXIOV. - Linearize part of skb when userspace provides vectors grater than MAX_SKB_FRAGS. - Return error when userspace provides vectors whose total length may exceed - MAX_SKB_FRAGS * PAGE_SIZE. Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>