• WANG Cong's avatar
    ipv6: reorder ip6_route_dev_notifier after ipv6_dev_notf · 5c333f84
    WANG Cong authored
    [ Upstream commit 242d3a49 ]
    
    For each netns (except init_net), we initialize its null entry
    in 3 places:
    
    1) The template itself, as we use kmemdup()
    2) Code around dst_init_metrics() in ip6_route_net_init()
    3) ip6_route_dev_notify(), which is supposed to initialize it after
       loopback registers
    
    Unfortunately the last one still happens in a wrong order because
    we expect to initialize net->ipv6.ip6_null_entry->rt6i_idev to
    net->loopback_dev's idev, thus we have to do that after we add
    idev to loopback. However, this notifier has priority == 0 same as
    ipv6_dev_notf, and ipv6_dev_notf is registered after
    ip6_route_dev_notifier so it is called actually after
    ip6_route_dev_notifier. This is similar to commit 2f460933
    ("ipv6: initialize route null entry in addrconf_init()") which
    fixes init_net.
    
    Fix it by picking a smaller priority for ip6_route_dev_notifier.
    Also, we have to release the refcnt accordingly when unregistering
    loopback_dev because device exit functions are called before subsys
    exit functions.
    Acked-by: default avatarDavid Ahern <dsahern@gmail.com>
    Tested-by: default avatarDavid Ahern <dsahern@gmail.com>
    Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    5c333f84
addrconf.c 144 KB