netdev - [PATCH AUTOSEL 5.10 18/38] bpf, net: Use DEV_STAT

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Message-ID: <20240801003643.3938534-18-sashal@kernel.org>
Date: Wed, 31 Jul 2024 20:35:24 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: yunshui <jiangyunshui@...inos.cn>,
	syzbot <syzkaller@...glegroups.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	Sasha Levin <sashal@...nel.org>,
	martin.lau@...ux.dev,
	ast@...nel.org,
	andrii@...nel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	bpf@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.10 18/38] bpf, net: Use DEV_STAT_INC()

From: yunshui <jiangyunshui@...inos.cn>

[ Upstream commit d9cbd8343b010016fcaabc361c37720dcafddcbe ]

syzbot/KCSAN reported that races happen when multiple CPUs updating
dev->stats.tx_error concurrently. Adopt SMP safe DEV_STATS_INC() to
update the dev->stats fields.

Reported-by: syzbot <syzkaller@...glegroups.com>
Signed-off-by: yunshui <jiangyunshui@...inos.cn>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Link: https://lore.kernel.org/bpf/20240523033520.4029314-1-jiangyunshui@kylinos.cn
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/core/filter.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index a3101cdfd47b9..001da7ccb7089 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2266,12 +2266,12 @@ static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev,
 
 	err = bpf_out_neigh_v6(net, skb, dev, nh);
 	if (unlikely(net_xmit_eval(err)))
-		dev->stats.tx_errors++;
+		DEV_STATS_INC(dev, tx_errors);
 	else
 		ret = NET_XMIT_SUCCESS;
 	goto out_xmit;
 out_drop:
-	dev->stats.tx_errors++;
+	DEV_STATS_INC(dev, tx_errors);
 	kfree_skb(skb);
 out_xmit:
 	return ret;
@@ -2379,12 +2379,12 @@ static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev,
 
 	err = bpf_out_neigh_v4(net, skb, dev, nh);
 	if (unlikely(net_xmit_eval(err)))
-		dev->stats.tx_errors++;
+		DEV_STATS_INC(dev, tx_errors);
 	else
 		ret = NET_XMIT_SUCCESS;
 	goto out_xmit;
 out_drop:
-	dev->stats.tx_errors++;
+	DEV_STATS_INC(dev, tx_errors);
 	kfree_skb(skb);
 out_xmit:
 	return ret;
-- 
2.43.0