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* [PATCH] net: openvswitch: Fix Use-After-Free in ovs_ct_exit
@ 2024-04-22  9:37 Hyunwoo Kim
  2024-04-22 10:40 ` Eric Dumazet
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Hyunwoo Kim @ 2024-04-22  9:37 UTC (permalink / raw)
  To: pshelar, edumazet; +Cc: v4bel, imv4bel, davem, kuba, pabeni, netdev, dev

Since kfree_rcu, which is called in the hlist_for_each_entry_rcu traversal
of ovs_ct_limit_exit, is not part of the RCU read critical section, it
is possible that the RCU grace period will pass during the traversal and
the key will be free.

To prevent this, it should be changed to hlist_for_each_entry_safe.

Fixes: 11efd5cb04a1 ("openvswitch: Support conntrack zone limit")
Signed-off-by: Hyunwoo Kim <v4bel@theori.io>
---
 net/openvswitch/conntrack.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 74b63cdb5992..2928c142a2dd 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -1593,9 +1593,9 @@ static void ovs_ct_limit_exit(struct net *net, struct ovs_net *ovs_net)
 	for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
 		struct hlist_head *head = &info->limits[i];
 		struct ovs_ct_limit *ct_limit;
+		struct hlist_node *next;
 
-		hlist_for_each_entry_rcu(ct_limit, head, hlist_node,
-					 lockdep_ovsl_is_held())
+		hlist_for_each_entry_safe(ct_limit, next, head, hlist_node)
 			kfree_rcu(ct_limit, rcu);
 	}
 	kfree(info->limits);
-- 
2.34.1


^ permalink raw reply related	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2024-04-25  2:40 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2024-04-22  9:37 [PATCH] net: openvswitch: Fix Use-After-Free in ovs_ct_exit Hyunwoo Kim
2024-04-22 10:40 ` Eric Dumazet
2024-04-24 14:58 ` [ovs-dev] " Aaron Conole
2024-04-25  2:40 ` patchwork-bot+netdevbpf

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