net_sched: sch_hfsc: fix classification loops
When attaching filters to a class pointing to a class higher up in the hierarchy, classification may enter an endless loop. Currently this is prevented for filters that are already resolved, but not for filters resolved at runtime. Only allow filters to point downwards in the hierarchy, similar to what CBQ does. Reported-by: NPawel Staszewski <pstaszewski@itcare.pl> Signed-off-by: NPatrick McHardy <kaber@trash.net> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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