linux-kernel - [PATCH 5.0 220/346] net: hns3: check resetting status in hns3_get

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Date:   Wed, 29 May 2019 20:04:53 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Huazhong Tan <tanhuazhong@...wei.com>,
        Peng Li <lipeng321@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.0 220/346] net: hns3: check resetting status in hns3_get_stats()

[ Upstream commit c4e401e5a934bb0798ebbba98e08dab129695eff ]

hns3_get_stats() should check the resetting status firstly,
since the device will be reinitialized when resetting. If the
reset has not completed, the hns3_get_stats() may access
invalid memory.

Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
Signed-off-by: Peng Li <lipeng321@...wei.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
index e678b6939da39..36b35c58304b5 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
@@ -482,6 +482,11 @@ static void hns3_get_stats(struct net_device *netdev,
 	struct hnae3_handle *h = hns3_get_handle(netdev);
 	u64 *p = data;
 
+	if (hns3_nic_resetting(netdev)) {
+		netdev_err(netdev, "dev resetting, could not get stats\n");
+		return;
+	}
+
 	if (!h->ae_algo->ops->get_stats || !h->ae_algo->ops->update_stats) {
 		netdev_err(netdev, "could not get any statistics\n");
 		return;
-- 
2.20.1