| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 143/143] net/sched: cls_api: add missing validation of netlink attributes | Date | Fri, 2 Nov 2018 19:35:28 +0100 |
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4.14-stable review patch. If anyone has any objections, please let me know.
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From: Davide Caratti <dcaratti@redhat.com>
[ Upstream commit e331473fee3d500bb0d2582a1fe598df3326d8cd ]
Similarly to what has been done in 8b4c3cdd9dd8 ("net: sched: Add policy validation for tc attributes"), fix classifier code to add validation of TCA_CHAIN and TCA_KIND netlink attributes.
tested with: # ./tdc.py -c filter
v2: Let sch_api and cls_api share nla_policy they have in common, thanks to David Ahern. v3: Avoid EXPORT_SYMBOL(), as validation of those attributes is not done by TC modules, thanks to Cong Wang. While at it, restore the 'Delete / get qdisc' comment to its orginal position, just above tc_get_qdisc() function prototype.
Fixes: 5bc1701881e39 ("net: sched: introduce multichain support for filters") Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/sched/cls_api.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
--- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -31,6 +31,8 @@ #include <net/pkt_sched.h> #include <net/pkt_cls.h> +extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1]; + /* The list of all installed classifier types */ static LIST_HEAD(tcf_proto_base); @@ -559,7 +561,7 @@ static int tc_ctl_tfilter(struct sk_buff replay: tp_created = 0; - err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); + err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack); if (err < 0) return err; @@ -836,7 +838,8 @@ static int tc_dump_tfilter(struct sk_buf if (nlmsg_len(cb->nlh) < sizeof(*tcm)) return skb->len; - err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL); + err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, rtm_tca_policy, + NULL); if (err) return err;
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