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Commit ff25276d authored by Vlad Buslov's avatar Vlad Buslov Committed by David S. Miller
Browse files

net: sched: act_ipt: remove dependency on rtnl lock 



Use tcf spinlock to protect ipt action private data from concurrent
modification during dump. Ipt init already takes tcf spinlock when
modifying ipt state.

Signed-off-by: default avatarVlad Buslov <vladbu@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 54d0d423

net/sched/act_ipt.c

+3 −0
Original line number Diff line number Diff line
@@ -288,6 +288,7 @@ static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, 
	 * for foolproof you need to not assume this

	 */



	spin_lock_bh(&ipt->tcf_lock);

	t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);

	if (unlikely(!t))

		goto nla_put_failure;
@@ -307,10 +308,12 @@ static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, 
	if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD))

		goto nla_put_failure;



	spin_unlock_bh(&ipt->tcf_lock);

	kfree(t);

	return skb->len;



nla_put_failure:

	spin_unlock_bh(&ipt->tcf_lock);

	nlmsg_trim(skb, b);

	kfree(t);

	return -1;