net: sched: cgroup: verify that filter is not NULL during walk
Check that filter is not NULL before passing it to tcf_walker->fn() callback in cls_cgroup_walk(). This can happen when cls_cgroup_change() failed to set first filter. Fixes: ed76f5ed ("net: sched: protect filter_chain list with filter_chain_lock mutex") Signed-off-by: NVlad Buslov <vladbu@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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