scsi: hisi_sas: check sas_dev gone earlier in hisi_sas_abort_task()

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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 <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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Xiang Chen 2018-05-02 23:56:28 +08:00 • committed by Martin K. Petersen

parent a14da7a20d

commit c6ef895472

1 changed files with 6 additions and 5 deletions

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drivers/scsi/hisi_sas/hisi_sas_main.c

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