net: sched: cgroup: verify that filter is not NULL during walk

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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: ed76f5edcc ("net: sched: protect filter_chain list with filter_chain_lock mutex")
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Vlad Buslov 2019-02-15 17:18:44 +02:00 • committed by David S. Miller

parent d66022cd16

commit 8b58d12f4a

1 changed files with 2 additions and 0 deletions

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net/sched/cls_cgroup.c

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