net: hns3: fix the exception when query imp info

When the command for querying imp info is issued to the firmware,
if the firmware does not support the command, the returned value
of bd num is 0.
Add protection mechanism before alloc memory to prevent apply for
0-length memory.

Fixes: 6917b8b2347e ("net: hns3: refactor dump m7 info of debugfs")
Signed-off-by: Jiaran Zhang <zhangjiaran@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
index 68ed1715ac5285945b529e4ac85e6fc782da1341..87d96f82c3182c74bda6959dc958b42dd177bf35 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
@@ -1724,6 +1724,10 @@ hclge_dbg_get_imp_stats_info(struct hclge_dev *hdev, char *buf, int len)
        }
 
        bd_num = le32_to_cpu(req->bd_num);
+       if (!bd_num) {
+               dev_err(&hdev->pdev->dev, "imp statistics bd number is 0!\n");
+               return -EINVAL;
+       }
 
        desc_src = kcalloc(bd_num, sizeof(struct hclge_desc), GFP_KERNEL);
        if (!desc_src)