| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.18 118/168] net: ena: fix surprise unplug NULL dereference kernel crash | Date | Mon, 8 Oct 2018 20:31:38 +0200 |
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4.18-stable review patch. If anyone has any objections, please let me know.
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From: Netanel Belgazal <netanel@amazon.com>
[ Upstream commit 772ed869f535b4ec2b134645c951ff22de4d3f79 ]
Starting with driver version 1.5.0, in case of a surprise device unplug, there is a race caused by invoking ena_destroy_device() from two different places. As a result, the readless register might be accessed after it was destroyed.
Signed-off-by: Netanel Belgazal <netanel@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/net/ethernet/amazon/ena/ena_netdev.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c @@ -3408,12 +3408,12 @@ static void ena_remove(struct pci_dev *p netdev->rx_cpu_rmap = NULL; } #endif /* CONFIG_RFS_ACCEL */ - - unregister_netdev(netdev); del_timer_sync(&adapter->timer_service); cancel_work_sync(&adapter->reset_task); + unregister_netdev(netdev); + /* Reset the device only if the device is running. */ if (test_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags)) ena_com_dev_reset(ena_dev, adapter->reset_reason);
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