netdev - [PATCH net] net/sched: flower: Add lock protection when remove filter handle

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Date: Tue, 20 Feb 2024 08:59:28 +0000
From: Jianbo Liu <jianbol@...dia.com>
To: <netdev@...r.kernel.org>, <davem@...emloft.net>
CC: Jianbo Liu <jianbol@...dia.com>, Cosmin Ratiu <cratiu@...dia.com>, "Gal
 Pressman" <gal@...dia.com>, Jamal Hadi Salim <jhs@...atatu.com>, Cong Wang
	<xiyou.wangcong@...il.com>, Jiri Pirko <jiri@...nulli.us>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Simon Horman <horms@...nel.org>, Paul Blakey
	<paulb@...dia.com>, Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Subject: [PATCH net] net/sched: flower: Add lock protection when remove filter handle

As IDR can't protect itself from the concurrent modification, place
idr_remove() under the protection of tp->lock.

Fixes: 08a0063df3ae ("net/sched: flower: Move filter handle initialization earlier")
Signed-off-by: Jianbo Liu <jianbol@...dia.com>
Reviewed-by: Cosmin Ratiu <cratiu@...dia.com>
Reviewed-by: Gal Pressman <gal@...dia.com>
---
 net/sched/cls_flower.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index bfedc3d4423d..e1314674b4a9 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -2460,8 +2460,11 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
 	}
 
 errout_idr:
-	if (!fold)
+	if (!fold) {
+		spin_lock(&tp->lock);
 		idr_remove(&head->handle_idr, fnew->handle);
+		spin_unlock(&tp->lock);
+	}
 	__fl_put(fnew);
 errout_tb:
 	kfree(tb);
-- 
2.26.2