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Date:   Wed, 29 May 2019 20:04:54 -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, Jian Shen <shenjian15@...wei.com>,
        Peng Li <lipeng321@...wei.com>,
        Huazhong Tan <tanhuazhong@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.0 221/346] net: hns3: add protect when handling mac addr list

[ Upstream commit 389775a6605e040dddea21a778a88eaaa57c068d ]

It used netdev->uc and netdev->mc list in function
hns3_recover_hw_addr() and hns3_remove_hw_addr().
We should add protect for them.

Fixes: f05e21097121 ("net: hns3: Clear mac vlan table entries when unload driver or function reset")
Signed-off-by: Jian Shen <shenjian15@...wei.com>
Signed-off-by: Peng Li <lipeng321@...wei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@...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_enet.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index fb5cb15aea9ec..a6481bd34c3bb 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -3794,12 +3794,13 @@ static int hns3_recover_hw_addr(struct net_device *ndev)
 	struct netdev_hw_addr *ha, *tmp;
 	int ret = 0;
 
+	netif_addr_lock_bh(ndev);
 	/* go through and sync uc_addr entries to the device */
 	list = &ndev->uc;
 	list_for_each_entry_safe(ha, tmp, &list->list, list) {
 		ret = hns3_nic_uc_sync(ndev, ha->addr);
 		if (ret)
-			return ret;
+			goto out;
 	}
 
 	/* go through and sync mc_addr entries to the device */
@@ -3807,9 +3808,11 @@ static int hns3_recover_hw_addr(struct net_device *ndev)
 	list_for_each_entry_safe(ha, tmp, &list->list, list) {
 		ret = hns3_nic_mc_sync(ndev, ha->addr);
 		if (ret)
-			return ret;
+			goto out;
 	}
 
+out:
+	netif_addr_unlock_bh(ndev);
 	return ret;
 }
 
@@ -3820,6 +3823,7 @@ static void hns3_remove_hw_addr(struct net_device *netdev)
 
 	hns3_nic_uc_unsync(netdev, netdev->dev_addr);
 
+	netif_addr_lock_bh(netdev);
 	/* go through and unsync uc_addr entries to the device */
 	list = &netdev->uc;
 	list_for_each_entry_safe(ha, tmp, &list->list, list)
@@ -3830,6 +3834,8 @@ static void hns3_remove_hw_addr(struct net_device *netdev)
 	list_for_each_entry_safe(ha, tmp, &list->list, list)
 		if (ha->refcount > 1)
 			hns3_nic_mc_unsync(netdev, ha->addr);
+
+	netif_addr_unlock_bh(netdev);
 }
 
 static void hns3_clear_tx_ring(struct hns3_enet_ring *ring)
-- 
2.20.1



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