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bpf, net: Use DEV_STAT_INC()

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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@googlegroups.com>
Signed-off-by: yunshui <jiangyunshui@kylinos.cn>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240523033520.4029314-1-jiangyunshui@kylinos.cn
This commit is contained in:
yunshui 2024-05-23 11:35:20 +08:00 committed by Daniel Borkmann
parent e245ef8a0b
commit d9cbd8343b
1 changed files with 4 additions and 4 deletions
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8
net/core/filter.c
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@ -2274,12 +2274,12 @@ 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;
@ -2380,12 +2380,12 @@ 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;