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authorJiri Pirko <jiri@mellanox.com>2017-05-20 16:01:32 +0300
committerDavid S. Miller <davem@davemloft.net>2017-05-23 18:00:07 +0300
commitf93e1cdcf42c1218e2a73be477d8ac21135e7f56 (patch)
tree5ad589f300e3c2e2f7d053b0d15f5c1ee4157178 /net/sched/cls_api.c
parent31efcc250a1dea96edca6595a9639d898cf99ae5 (diff)
downloadlinux-f93e1cdcf42c1218e2a73be477d8ac21135e7f56.tar.xz
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: 5bc1701881e3 ("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>
Diffstat (limited to 'net/sched/cls_api.c')
-rw-r--r--net/sched/cls_api.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 85088ed07f6a..01a8b8b4bab8 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -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;
}