RE: [PATCH net-next] net: hns3: Fix potential NULL dereference on allocation error

[Salil Mehta <salil.mehta@huawei.com>]

> From: yuehaibing
> Sent: Friday, January 25, 2019 3:14 AM
> To: davem@davemloft.net; Zhuangyuzeng (Yisen) <yisen.zhuang@huawei.com>;
> Salil Mehta <salil.mehta@huawei.com>; lipeng (Y) <lipeng321@huawei.com>
> Cc: linux-kernel@vger.kernel.org; netdev@vger.kernel.org; yuehaibing <yuehaibing@huawei.com>
> Subject: [PATCH net-next] net: hns3: Fix potential NULL dereference on
> allocation error
> 
> hclge_mac_update_stats_complete doesn't check for NULL
> returns of kcalloc, it may result in an Oops.
> 
> Fixes: d174ea75c96a ("net: hns3: add statistics for PFC frames and MAC
> control frames")
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
> ---
>  drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
> b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
> index 64b1589..7971606 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
> @@ -343,6 +343,9 @@ static int hclge_mac_update_stats_complete(struct
> hclge_dev *hdev, u32 desc_num)
>  	int ret;
> 
>  	desc = kcalloc(desc_num, sizeof(struct hclge_desc), GFP_KERNEL);
> +	if (!desc)
> +		return -ENOMEM;
> +


looks good to me.

Reviewed-by: Salil Mehta <salil.mehta@huawei.com>