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| author | Vlad Buslov <vladbu@mellanox.com> | 2018-08-10 20:51:45 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-08-11 12:37:09 -0700 |
| commit | ff25276de997f41197ebab91935627c249a30fc4 (patch) | |
| tree | 6de06ae2ad225b18e3326b3c693ee596249a7dca /net/sched/act_ipt.c | |
| parent | 54d0d423a48aa0e61bb39665d20376ba7b940535 (diff) | |
| download | lwn-ff25276de997f41197ebab91935627c249a30fc4.tar.gz lwn-ff25276de997f41197ebab91935627c249a30fc4.zip | |
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: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/act_ipt.c')
| -rw-r--r-- | net/sched/act_ipt.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/sched/act_ipt.c b/net/sched/act_ipt.c index 0dc787a57798..e149f0e66cb6 100644 --- a/net/sched/act_ipt.c +++ b/net/sched/act_ipt.c @@ -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; |