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

[YueHaibing]

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 <yuehaib...@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;
+
        hclge_cmd_setup_basic_desc(&desc[0], HCLGE_OPC_STATS_MAC_ALL, true);
        ret = hclge_cmd_send(&hdev->hw, desc, desc_num);
        if (ret) {
-- 
2.7.0