From: Peter Oskolkov <p...@google.com>
Date: Mon, 17 Sep 2018 10:20:53 -0700
> DST_NOCOUNT in dst_entry::flags tracks whether the entry counts
> toward route cache size (net->ipv6.sysctl.ip6_rt_max_size).
>
> If the flag is NOT set, dst_ops::pcpuc_entries counter is incremented
> in dist_init() and decremented in dst_destroy().
>
> This flag is tied to allocation/deallocation of dst_entry and
> should not be copied from another dst/route. Otherwise it can happen
> that dst_ops::pcpuc_entries counter grows until no new routes can
> be allocated because the counter reached ip6_rt_max_size due to
> DST_NOCOUNT not set and thus no counter decrements on gc-ed routes.
>
> Fixes: 3b6761d18bc1 ("net/ipv6: Move dst flags to booleans in fib entries")
> Cc: David Ahern <dsah...@gmail.com>
> Acked-by: Wei Wang <wei...@google.com>
> Signed-off-by: Peter Oskolkov <p...@google.com>
Applied and queued up for -stable, thank you.
