In pcie_device_make_active, pcie_device may be freed by
pcie_device_put(pcie_device). After it, the refcount of
pcie_device is increased by pcie_device_get(pcie_device).
The pcie_device is freed but refcount is non-zero. It could
cause use after free later.
My patch puts the pcie_device_get() ahead of pcie_device_put()
to avoid uaf.
Signed-off-by: Lv Yunlong <lyl2019@xxxxxxxxxxxxxxxx>
---
drivers/scsi/mpt3sas/mpt3sas_scsih.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index ffca03064797..17061f54d616 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -11432,12 +11432,12 @@ static void pcie_device_make_active(struct MPT3SAS_ADAPTER *ioc,
unsigned long flags;
spin_lock_irqsave(&ioc->pcie_device_lock, flags);
-
+ pcie_device_get(pcie_device);
+
if (!list_empty(&pcie_device->list)) {
list_del_init(&pcie_device->list);
pcie_device_put(pcie_device);
}
- pcie_device_get(pcie_device);
list_add_tail(&pcie_device->list, &ioc->pcie_device_list);
spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
--
2.25.1
