This is a note to let you know that I've just added the patch titled
scsi: message: mptlan: Fix use after free bug in mptlan_remove() due to race condition
to the 5.15-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:
scsi-message-mptlan-fix-use-after-free-bug-in-mptlan.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0c74ecea34bb987b37464ec1554b838484558eb6
Author: Zheng Wang <zyytlz.wz@xxxxxxx>
Date: Sat Mar 18 16:16:35 2023 +0800
scsi: message: mptlan: Fix use after free bug in mptlan_remove() due to race condition
[ 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>
diff --git a/drivers/message/fusion/mptlan.c b/drivers/message/fusion/mptlan.c
index 3261cac762def..ec3ee356078db 100644
--- a/drivers/message/fusion/mptlan.c
+++ b/drivers/message/fusion/mptlan.c
@@ -1427,7 +1427,9 @@ 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);
