scsi: pm8001: Fix use-after-free for aborted SSP/STP sas_task

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: scsi: pm8001: Fix use-after-free for aborted SSP/STP sas_task Currently a use-after-free may occur if a sas_task is aborted by the upper layer before we handle the I/O completion in mpi_ssp_completion() or mpi_sata_completion(). In this case, the following are the two steps in handling those I/O completions: - Call complete() to inform the upper layer handler of completion of the I/O. - Release driver resources associated with the sas_task in pm8001_ccb_task_free() call. When complete() is called, the upper layer may free the sas_task. As such, we should not touch the associated sas_task afterwards, but we do so in the pm8001_ccb_task_free() call. Fix by swapping the complete() and pm8001_ccb_task_free() calls ordering.

References

• https://git.kernel.org/stable/c/fe9ac3eaa2e387a5742b380b73a5a6bc237bf184
• https://git.kernel.org/stable/c/d9d93f32534a0a80a1c26bdb0746d90a7b19c2c2
• https://git.kernel.org/stable/c/f61f9fccb2cb4bb275674a79d638704db6bc2171
• https://git.kernel.org/stable/c/df7abcaa1246e2537ab4016077b5443bb3c09378