net/sched: cls_api: complement tcf_tfilter_dump_policy
In function `tc_dump_tfilter`, the attributes array is parsed via tcf_tfilter_dump_policy which only describes TCA_DUMP_FLAGS. However, the NLA TCA_CHAIN is also accessed with `nla_get_u32`. The access to TCA_CHAIN is introduced in commit5bc1701881
("net: sched: introduce multichain support for filters") and no nla_policy is provided for parsing at that point. Later on, tcf_tfilter_dump_policy is introduced in commitf8ab1807a9
("net: sched: introduce terse dump flag") while still ignoring the fact that TCA_CHAIN needs a check. This patch does that by complementing the policy to allow the access discussed here can be safe as other cases just choose rtm_tca_policy as the parsing policy. Signed-off-by: Lin Ma <linma@zju.edu.cn> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -2735,6 +2735,7 @@ errout:
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static const struct nla_policy tcf_tfilter_dump_policy[TCA_MAX + 1] = {
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[TCA_CHAIN] = { .type = NLA_U32 },
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[TCA_DUMP_FLAGS] = NLA_POLICY_BITFIELD32(TCA_DUMP_FLAGS_TERSE),
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};
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