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net/sched: fix filter flushing 

When user instructs to remove all filters from chain, we cannot destroy
the chain as other actions may hold a reference. Also the put in errout
would try to destroy it again. So instead, just walk the chain and remove
all existing filters.

Fixes: 5bc1701881 ("net: sched: introduce multichain support for filters")
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Jiri Pirko 2017-05-20 15:01:32 +02:00 committed by David S. Miller
parent 31efcc250a
commit f93e1cdcf4
1 changed files with 10 additions and 3 deletions
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13
net/sched/cls_api.c
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@ -201,15 +201,22 @@ static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
return chain;
}
static void tcf_chain_destroy(struct tcf_chain *chain)
static void tcf_chain_flush(struct tcf_chain *chain)
{
struct tcf_proto *tp;
list_del(&chain->list);
if (*chain->p_filter_chain)
RCU_INIT_POINTER(*chain->p_filter_chain, NULL);
while ((tp = rtnl_dereference(chain->filter_chain)) != NULL) {
RCU_INIT_POINTER(chain->filter_chain, tp->next);
tcf_proto_destroy(tp);
}
}
static void tcf_chain_destroy(struct tcf_chain *chain)
{
list_del(&chain->list);
tcf_chain_flush(chain);
kfree(chain);
}
@ -510,7 +517,7 @@ replay:
if (n->nlmsg_type == RTM_DELTFILTER && prio == 0) {
tfilter_notify_chain(net, skb, n, chain, RTM_DELTFILTER);
tcf_chain_destroy(chain);
tcf_chain_flush(chain);
err = 0;
goto errout;
}