[PACKET]: Don't truncate non-linear skbs with mmaped IO
Non-linear skbs are truncated to their linear part with mmaped IO. Fix by using skb_copy_bits instead of memcpy. Signed-off-by: NPatrick McHardy <kaber@trash.net> Acked-by: NAlexey Kuznetsov <kuznet@ms2.inr.ac.ru> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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