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Message-ID: <4b056799-b330-cff1-963c-24ca138817a2@huawei.com>
Date: Sat, 26 Dec 2020 14:38:43 +0800
From: Yonglong Liu <liuyonglong@...wei.com>
To: wangyunjian <wangyunjian@...wei.com>, <netdev@...r.kernel.org>
CC: <yisen.zhuang@...wei.com>, <salil.mehta@...wei.com>,
<jerry.lilijun@...wei.com>, <xudingke@...wei.com>
Subject: Re: [PATCH net] net: hns: fix return value check in
__lb_other_process()
On 2020/12/25 18:35, wangyunjian wrote:
> From: Yunjian Wang <wangyunjian@...wei.com>
>
> The function skb_copy() could return NULL, the return value
> need to be checked.
>
> Fixes: b5996f11ea54 ("net: add Hisilicon Network Subsystem basic ethernet support")
> Signed-off-by: Yunjian Wang <wangyunjian@...wei.com>
> ---
> drivers/net/ethernet/hisilicon/hns/hns_ethtool.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
> index 7165da0ee9aa..ad18f0e20a23 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
> @@ -415,6 +415,10 @@ static void __lb_other_process(struct hns_nic_ring_data *ring_data,
> /* for mutl buffer*/
> new_skb = skb_copy(skb, GFP_ATOMIC);
> dev_kfree_skb_any(skb);
> + if (!new_skb) {
> + ndev->stats.rx_dropped++;
You can add a new drop type to ring->states, and then add it to
ndev->stats.rx_dropped,
then you can know that the rx_dropped is from skb_copy() failed.
This process is from self-test, maybe you can just add a error message
rather than increase
the ndev->stats.rx_dropped.
> + return;
> + }
> skb = new_skb;
>
> check_ok = 0;
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