From: Hao Chen <chenhao288@hisilicon.com>
Date: Fri, 26 Nov 2021 20:03:16 +0800
Subject: net: hns3: add check NULL address for page pool
Patch-mainline: v5.16-rc3
Git-commit: b8af344cfea189cdc0fef41345e55aed76723615
References: bsc#1190336

When page pool is not enabled, its address value is still NULL and page
pool should not be accessed, so add a check for it.

Fixes: 850bfb912a6d ("net: hns3: debugfs add support dumping page pool info")
Signed-off-by: Hao Chen <chenhao288@hisilicon.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
@@ -1106,6 +1106,11 @@ hns3_dbg_page_pool_info(struct hnae3_han
 		return -EFAULT;
 	}
 
+	if (!priv->ring[h->kinfo.num_tqps].page_pool) {
+		dev_err(&h->pdev->dev, "page pool is not initialized\n");
+		return -EFAULT;
+	}
+
 	for (i = 0; i < ARRAY_SIZE(page_pool_info_items); i++)
 		result[i] = &data_str[i][0];