tun: fix issues of iovec iterators using in tun_put_user()
This patch fixes two issues after using iovec iterators: - vlan_offset should be initialized to zero, otherwise unexpected offset will be used in skb_copy_datagram_iter() - advance iovec iterator when vnet_hdr_sz is greater than sizeof(gso), this is the case when mergeable rx buffer were enabled for a virt guest. Fixes e0b46d0e ("tun: Use iovec iterators") Cc: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: NJason Wang <jasowang@redhat.com> Acked-by: NHerbert Xu <herbert@gondor.apana.org.au> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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