[PATCH 05/11] scsi: hisi_sas: check sas_dev gone earlier in hisi_sas_abort_task()

[John Garry]

From: Xiang Chen <chenxian...@hisilicon.com>

It is possible to dereference a NULL-pointer in hisi_sas_abort_task()
in special scenario when the device has been removed.

If an SMP task times-out, it will call hisi_sas_abort_task() to
recover. And currently there is a check in hisi_sas_abort_task() to
avoid the situation of processing the abort for the removed device.

However we have an ordering problem, in that we may reference
a task for the removed device before checking if the device has
been removed.

Fix this by only referencing the sas_dev after we know it is still
present.

Signed-off-by: Xiang Chen <chenxian...@hisilicon.com>
Signed-off-by: John Garry <john.ga...@huawei.com>
---
 drivers/scsi/hisi_sas/hisi_sas_main.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c 
b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 8f8e642..24416bb 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -1166,15 +1166,16 @@ static int hisi_sas_abort_task(struct sas_task *task)
        struct hisi_sas_tmf_task tmf_task;
        struct domain_device *device = task->dev;
        struct hisi_sas_device *sas_dev = device->lldd_dev;
-       struct hisi_hba *hisi_hba = dev_to_hisi_hba(task->dev);
-       struct device *dev = hisi_hba->dev;
+       struct hisi_hba *hisi_hba;
+       struct device *dev;
        int rc = TMF_RESP_FUNC_FAILED;
        unsigned long flags;
 
-       if (!sas_dev) {
-               dev_warn(dev, "Device has been removed\n");
+       if (!sas_dev)
                return TMF_RESP_FUNC_FAILED;
-       }
+
+       hisi_hba = dev_to_hisi_hba(task->dev);
+       dev = hisi_hba->dev;
 
        spin_lock_irqsave(&task->task_state_lock, flags);
        if (task->task_state_flags & SAS_TASK_STATE_DONE) {
-- 
1.9.1