linux-kernel - [PATCH] scsi: qla4xxx: Fix use after free bug in da9150_charger

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Date:   Fri, 10 Mar 2023 02:38:12 +0800
From:   Zheng Wang <zyytlz.wz@....com>
To:     njavali@...vell.com
Cc:     mrangankar@...vell.com, GR-QLogic-Storage-Upstream@...vell.com,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        hackerzheng666@...il.com, 1395428693sheep@...il.com,
        alex000young@...il.com, Zheng Wang <zyytlz.wz@....com>
Subject: [PATCH] scsi: qla4xxx: Fix use after free bug in da9150_charger_remove due to race condition

In qla4xxx_probe_adapter, &ha->dpc_work is bound with
qla4xxx_do_dpc. qla4xxx_post_aen_work may be called
to start the work.

If we remove the module which will call qla4xxx_remove_adapter
  to make cleanup, there may be a unfinished work. The possible
  sequence is as follows:

Fix it by canceling the work before cleanup in qla4xxx_remove_adapter

CPU0                  CPUc1

                    |qla4xxx_do_dpc
qla4xxx_remove_adapter|
scsi_remove_host  	|
kfree(ha->host)   	|
                    |
                    |   iscsi_host_for_each_session
                    |   //use ha->host
Fixes: afaf5a2d341d ("[SCSI] Initial Commit of qla4xxx")
Signed-off-by: Zheng Wang <zyytlz.wz@....com>
---
 drivers/scsi/qla4xxx/ql4_os.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index 005502125b27..d530cc853f43 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -9001,6 +9001,7 @@ static void qla4xxx_remove_adapter(struct pci_dev *pdev)
 	if (!pci_is_enabled(pdev))
 		return;
 
+	cancel_work_sync(&ha->dpc_work);
 	ha = pci_get_drvdata(pdev);
 
 	if (is_qla40XX(ha))
-- 
2.25.1