This is a note to let you know that I've just added the patch titled net: pxa168_eth: Fix a potential data race in pxa168_eth_remove to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-pxa168_eth-fix-a-potential-data-race-in-pxa168_e.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 2a0e40fc25120e5e286bf98281fd5b7e6d4a7fcf Author: Pavel Andrianov <andrianov@xxxxxxxxx> Date: Wed Mar 10 11:10:46 2021 +0300 net: pxa168_eth: Fix a potential data race in pxa168_eth_remove [ Upstream commit 0571a753cb07982cc82f4a5115e0b321da89e1f3 ] pxa168_eth_remove() firstly calls unregister_netdev(), then cancels a timeout work. unregister_netdev() shuts down a device interface and removes it from the kernel tables. If the timeout occurs in parallel, the timeout work (pxa168_eth_tx_timeout_task) performs stop and open of the device. It may lead to an inconsistent state and memory leaks. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Pavel Andrianov <andrianov@xxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/net/ethernet/marvell/pxa168_eth.c b/drivers/net/ethernet/marvell/pxa168_eth.c index 5d5000c8edf1..09cb0ac701e1 100644 --- a/drivers/net/ethernet/marvell/pxa168_eth.c +++ b/drivers/net/ethernet/marvell/pxa168_eth.c @@ -1571,8 +1571,8 @@ static int pxa168_eth_remove(struct platform_device *pdev) mdiobus_unregister(pep->smi_bus); mdiobus_free(pep->smi_bus); - unregister_netdev(dev); cancel_work_sync(&pep->tx_timeout_task); + unregister_netdev(dev); free_netdev(dev); return 0; }