netdev - Re: [PATCH 1/1] net: hns: avoid null pointer dereference

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Date:	Wed, 18 May 2016 09:04:07 +0800
From:	Yisen Zhuang <Yisen.zhuang@...wei.com>
To:	Heinrich Schuchardt <xypron.glpk@....de>,
	"David S. Miller" <davem@...emloft.net>
CC:	Kejian Yan <yankejian@...wei.com>, Lisheng <lisheng011@...wei.com>,
	Kenneth Lee <liguozhu@...wei.com>,
	Andrew Lunn <andrew@...n.ch>, Salil <salil.mehta@...wei.com>,
	Qianqian Xie <xieqianqian@...wei.com>,
	huangdaode <huangdaode@...ilicon.com>,
	Chenny Xu <chenny.xu@...wei.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] net: hns: avoid null pointer dereference

Hi Heinrich,

This patch is fine to me.

Thanks,

Yisen

在 2016/5/18 4:01, Heinrich Schuchardt 写道:
> In the statement
>   assert(priv || priv->ae_handle);
> the right side of || is only evaluated if priv is null.
> 
> Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
> ---
>  drivers/net/ethernet/hisilicon/hns/hns_ethtool.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
> index 3d746c8..834a50a 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
> @@ -720,7 +720,7 @@ static int hns_set_pauseparam(struct net_device *net_dev,
>  	struct hnae_handle *h;
>  	struct hnae_ae_ops *ops;
>  
> -	assert(priv || priv->ae_handle);
> +	assert(priv && priv->ae_handle);
>  
>  	h = priv->ae_handle;
>  	ops = h->dev->ops;
> @@ -780,7 +780,7 @@ static int hns_set_coalesce(struct net_device *net_dev,
>  	struct hnae_ae_ops *ops;
>  	int ret;
>  
> -	assert(priv || priv->ae_handle);
> +	assert(priv && priv->ae_handle);
>  
>  	ops = priv->ae_handle->dev->ops;
>  
> @@ -1111,7 +1111,7 @@ void hns_get_regs(struct net_device *net_dev, struct ethtool_regs *cmd,
>  	struct hns_nic_priv *priv = netdev_priv(net_dev);
>  	struct hnae_ae_ops *ops;
>  
> -	assert(priv || priv->ae_handle);
> +	assert(priv && priv->ae_handle);
>  
>  	ops = priv->ae_handle->dev->ops;
>  
> @@ -1135,7 +1135,7 @@ static int hns_get_regs_len(struct net_device *net_dev)
>  	struct hns_nic_priv *priv = netdev_priv(net_dev);
>  	struct hnae_ae_ops *ops;
>  
> -	assert(priv || priv->ae_handle);
> +	assert(priv && priv->ae_handle);
>  
>  	ops = priv->ae_handle->dev->ops;
>  	if (!ops->get_regs_len) {
>