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| author | Zheng Wang <zyytlz.wz@163.com> | 2023-03-18 16:16:35 +0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2023-03-24 20:38:50 -0400 |
| commit | f486893288f3e9b171b836f43853a6426515d800 (patch) | |
| tree | f957a0a57c5d007dfb7ccc50310496f393115466 /drivers/message | |
| parent | 75cb113cd43f06aaf4f1bda0069cfd5b98e909eb (diff) | |
| download | linux-f486893288f3e9b171b836f43853a6426515d800.tar.gz | |
scsi: message: mptlan: Fix use after free bug in mptlan_remove() due to race condition
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>
Diffstat (limited to 'drivers/message')
| -rw-r--r-- | drivers/message/fusion/mptlan.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/message/fusion/mptlan.c b/drivers/message/fusion/mptlan.c index 142eb5d5d9df..de2e7bcf4784 100644 --- a/drivers/message/fusion/mptlan.c +++ b/drivers/message/fusion/mptlan.c @@ -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); |