linux-kernel - [PATCH 4.18 121/168] net: ena: fix potential double ena_destroy

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Date:   Mon,  8 Oct 2018 20:31:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Netanel Belgazal <netanel@...zon.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 121/168] net: ena: fix potential double ena_destroy_device()

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Netanel Belgazal <netanel@...zon.com>

[ Upstream commit fe870c77efdf8682252545cbd3d29800d8379efc ]

ena_destroy_device() can potentially be called twice.
To avoid this, check that the device is running and
only then proceed destroying it.

Signed-off-by: Netanel Belgazal <netanel@...zon.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -2555,6 +2555,9 @@ static void ena_destroy_device(struct en
 	struct ena_com_dev *ena_dev = adapter->ena_dev;
 	bool dev_up;
 
+	if (!test_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags))
+		return;
+
 	netif_carrier_off(netdev);
 
 	del_timer_sync(&adapter->timer_service);
@@ -2591,6 +2594,7 @@ static void ena_destroy_device(struct en
 	adapter->reset_reason = ENA_REGS_RESET_NORMAL;
 
 	clear_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
+	clear_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags);
 }
 
 static int ena_restore_device(struct ena_adapter *adapter)
@@ -2635,6 +2639,7 @@ static int ena_restore_device(struct ena
 		}
 	}
 
+	set_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags);
 	mod_timer(&adapter->timer_service, round_jiffies(jiffies + HZ));
 	dev_err(&pdev->dev, "Device reset completed successfully\n");