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net: hns3: fix the exception when query imp info

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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: 0b198b0d80 ("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>
This commit is contained in:
Jiaran Zhang 2021-09-13 21:08:24 +08:00 committed by David S. Miller
parent b81d894874
commit 472430a7b0
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
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@ -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)