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net/sched: cls_api: add missing validation of netlink attributes
[ Upstream commit e331473 ] Similarly to what has been done in 8b4c3cd ("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: 5bc1701 ("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>
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