ipv4: Add a missing rcu_assign_pointer() in routing cache.
rt_intern_hash() is doing an update of a RCU guarded hash chain without using rcu_assign_pointer() or equivalent barrier. Signed-off-by: NEric Dumazet <dada1@cosmosbay.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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