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| author | Tonghao Zhang <xiangxia.m.yue@gmail.com> | 2020-04-17 02:57:31 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-05-02 16:17:12 +0200 |
| commit | fb885da71cc33a6487f142e016e7cd44d70cb8a6 (patch) | |
| tree | 68d843002cf538d9e526eb0161c1a305b42e9df5 | |
| parent | 740a06078ac58840494934ace6055eb879f267fb (diff) | |
| download | linux-stable-fb885da71cc33a6487f142e016e7cd44d70cb8a6.tar.gz linux-stable-fb885da71cc33a6487f142e016e7cd44d70cb8a6.tar.bz2 linux-stable-fb885da71cc33a6487f142e016e7cd44d70cb8a6.zip | |
net: openvswitch: ovs_ct_exit to be done under ovs_lock
[ Upstream commit 27de77cec985233bdf6546437b9761853265c505 ]
syzbot wrote:
| =============================
| WARNING: suspicious RCU usage
| 5.7.0-rc1+ #45 Not tainted
| -----------------------------
| net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader section!!
|
| other info that might help us debug this:
| rcu_scheduler_active = 2, debug_locks = 1
| ...
|
| stack backtrace:
| Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-0-ga698c8995f-prebuilt.qemu.org 04/01/2014
| Workqueue: netns cleanup_net
| Call Trace:
| ...
| ovs_ct_exit
| ovs_exit_net
| ops_exit_list.isra.7
| cleanup_net
| process_one_work
| worker_thread
To avoid that warning, invoke the ovs_ct_exit under ovs_lock and add
lockdep_ovsl_is_held as optional lockdep expression.
Link: https://lore.kernel.org/lkml/000000000000e642a905a0cbee6e@google.com
Fixes: 11efd5cb04a1 ("openvswitch: Support conntrack zone limit")
Cc: Pravin B Shelar <pshelar@ovn.org>
Cc: Yi-Hung Wei <yihung.wei@gmail.com>
Reported-by: syzbot+7ef50afd3a211f879112@syzkaller.appspotmail.com
Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 5ea7b72d4fac ("net: openvswitch: Fix Use-After-Free in ovs_ct_exit")
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | net/openvswitch/conntrack.c | 3 | ||||
| -rw-r--r-- | net/openvswitch/datapath.c | 4 |
2 files changed, 5 insertions, 2 deletions
diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c index 0777c8d416f1..352e80e6cd75 100644 --- a/net/openvswitch/conntrack.c +++ b/net/openvswitch/conntrack.c @@ -1837,7 +1837,8 @@ static void ovs_ct_limit_exit(struct net *net, struct ovs_net *ovs_net) struct hlist_head *head = &info->limits[i]; struct ovs_ct_limit *ct_limit; - hlist_for_each_entry_rcu(ct_limit, head, hlist_node) + hlist_for_each_entry_rcu(ct_limit, head, hlist_node, + lockdep_ovsl_is_held()) kfree_rcu(ct_limit, rcu); } kfree(ovs_net->ct_limit_info->limits); diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c index 0551915519d9..db27a43f5c5a 100644 --- a/net/openvswitch/datapath.c +++ b/net/openvswitch/datapath.c @@ -2390,8 +2390,10 @@ static void __net_exit ovs_exit_net(struct net *dnet) struct net *net; LIST_HEAD(head); - ovs_ct_exit(dnet); ovs_lock(); + + ovs_ct_exit(dnet); + list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) __dp_destroy(dp); |