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authorZheng Wang <zyytlz.wz@163.com>2023-04-13 06:34:22 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2023-04-25 06:32:13 +0300
commitc5749639f2d0a1f6cbe187d05f70c2e7c544d748 (patch)
treeb669ef8033d8acef4def85deb4072052517c94d8 /drivers/scsi
parent948afc69615167a3c82430f99bfd046332b89912 (diff)
downloadlinux-c5749639f2d0a1f6cbe187d05f70c2e7c544d748.tar.xz
scsi: qedi: Fix use after free bug in qedi_remove()
In qedi_probe() we call __qedi_probe() which initializes &qedi->recovery_work with qedi_recovery_handler() and &qedi->board_disable_work with qedi_board_disable_work(). When qedi_schedule_recovery_handler() is called, schedule_delayed_work() will finally start the work. In qedi_remove(), which is called to remove the driver, the following sequence may be observed: Fix this by finishing the work before cleanup in qedi_remove(). CPU0 CPU1 |qedi_recovery_handler qedi_remove | __qedi_remove | iscsi_host_free | scsi_host_put | //free shost | |iscsi_host_for_each_session |//use qedi->shost Cancel recovery_work and board_disable_work in __qedi_remove(). Fixes: 4b1068f5d74b ("scsi: qedi: Add MFW error recovery process") Signed-off-by: Zheng Wang <zyytlz.wz@163.com> Link: https://lore.kernel.org/r/20230413033422.28003-1-zyytlz.wz@163.com Acked-by: Manish Rangankar <mrangankar@marvell.com> Reviewed-by: Mike Christie <michael.christie@oracle.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/qedi/qedi_main.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/scsi/qedi/qedi_main.c b/drivers/scsi/qedi/qedi_main.c
index f2ee49756df8..45d359554182 100644
--- a/drivers/scsi/qedi/qedi_main.c
+++ b/drivers/scsi/qedi/qedi_main.c
@@ -2450,6 +2450,9 @@ static void __qedi_remove(struct pci_dev *pdev, int mode)
qedi_ops->ll2->stop(qedi->cdev);
}
+ cancel_delayed_work_sync(&qedi->recovery_work);
+ cancel_delayed_work_sync(&qedi->board_disable_work);
+
qedi_free_iscsi_pf_param(qedi);
rval = qedi_ops->common->update_drv_state(qedi->cdev, false);