[TIPC]: Enhance validation of format on incoming messages

This patch ensures that TIPC properly handles incoming messages
that have incorrect or unexpected formats.  Most significantly,
it now ensures that each sl_buff has at least as much data as
the message header indicates it should, and that the entire
message header is stored contiguously; this prevents TIPC from
accidentally accessing memory that is not part of the sk_buff.

Signed-off-by: Allan Stephens <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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