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scsi: message: mptlan: Fix use after free bug in mptlan_remove() due to race condition

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mptlan_probe() calls mpt_register_lan_device() which initializes the
&priv->post_buckets_task workqueue. A call to
mpt_lan_wake_post_buckets_task() will subsequently start the work.

During driver unload in mptlan_remove() the following race may occur:

CPU0                  CPU1

                    |mpt_lan_post_receive_buckets_work()
mptlan_remove()     |
  free_netdev()     |
    kfree(dev);     |
                    |
                    | dev->mtu
                    |   //use

Fix this by finishing the work prior to cleaning up in mptlan_remove().

[mkp: we really should remove mptlan instead of attempting to fix it]

Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Link: https://lore.kernel.org/r/20230318081635.796479-1-zyytlz.wz@163.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Zheng Wang 2023-03-18 16:16:35 +08:00 committed by Martin K. Petersen
parent 75cb113cd4
commit f486893288
1 changed files with 2 additions and 0 deletions
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2
drivers/message/fusion/mptlan.c
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@ -1433,7 +1433,9 @@ mptlan_remove(struct pci_dev *pdev)
{
MPT_ADAPTER *ioc = pci_get_drvdata(pdev);
struct net_device *dev = ioc->netdev;
struct mpt_lan_priv *priv = netdev_priv(dev);
cancel_delayed_work_sync(&priv->post_buckets_task);
if(dev != NULL) {
unregister_netdev(dev);
free_netdev(dev);