[PATCH AUTOSEL 6.2 18/53] scsi: message: mptlan: Fix use after free bug in mptlan_remove() due to race condition

[Sasha Levin]

From: Zheng Wang <zyytlz.wz@xxxxxxx>

[ Upstream commit f486893288f3e9b171b836f43853a6426515d800 ]

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@xxxxxxx>
Link: https://lore.kernel.org/r/20230318081635.796479-1-zyytlz.wz@xxxxxxx
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/message/fusion/mptlan.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/message/fusion/mptlan.c b/drivers/message/fusion/mptlan.c
index 142eb5d5d9df6..de2e7bcf47847 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);
-- 
2.39.2