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net/ipv6: Make from in rt6_info rcu protected
When a dst entry is created from a fib entry, the 'from' in rt6_info is set to the fib entry. The 'from' reference is used most notably for cookie checking - making sure stale dst entries are updated if the fib entry is changed. When a fib entry is deleted, the pcpu routes on it are walked releasing the fib6_info reference. This is needed for the fib6_info cleanup to happen and to make sure all device references are released in a timely manner. There is a race window when a FIB entry is deleted and the 'from' on the pcpu route is dropped and the pcpu route hits a cookie check. Handle this race using rcu on from. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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