ipv6: tcp: add rcu locking in tcp_v6_send_synack()
When first SYNACK is sent, we already hold rcu_read_lock(), but this is not true if a SYNACK is retransmitted, as a timer (soft) interrupt does not hold rcu_read_lock() Fixes: 45f6fad8 ("ipv6: add complete rcu protection around np->opt") Reported-by: NDave Jones <davej@codemonkey.org.uk> Signed-off-by: NEric Dumazet <edumazet@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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