[IPV6] tcp_v6_send_synack: release the destination
This patch fix dst reference counting in tcp_v6_send_synack Analysis: Currently tcp_v6_send_synack is never called with a dst entry so dst always comes in as NULL. ip6_dst_lookup calls ip6_route_output which calls dst_hold before it returns the dst entry. Neither xfrm_lookup nor tcp_make_synack consume the dst entry so we still have a dst_entry with a bumped refrence count at the end of this function. Therefore we need to call dst_release just before we return just like tcp_v4_send_synack does. Signed-off-by: NEric W. Biederman <ebiederm@xmission.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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