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A recent commit had an unintended side effect with reject routes:
rt6i_pcpu is expected to always be initialized for all fib6_info except
the null entry. The commit mentioned below skips it for reject routes
and ends up leaking references to the loopback device. For example,
ip netns add foo
ip -netns foo li set lo up
ip -netns foo -6 ro add blackhole 2001:db8:1::1
ip netns exec foo ping6 2001:db8:1::1
ip netns del foo
ends up spewing:
unregister_netdevice: waiting for lo to become free. Usage count = 3
The fib_nh_common_init is not needed for reject routes (no ipv4 caching
or encaps), so move the alloc_percpu_gfp after it and adjust the goto label.
Fixes: f40b6ae2b612 ("ipv6: Move pcpu cached routes to fib6_nh")
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7dd73168e2