Bug 2298128 (CVE-2022-48792)

Summary: CVE-2022-48792 kernel: scsi: pm8001: Fix use-after-free for aborted SSP/STP sas_task
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: kernel 5.10.102, kernel 5.15.25, kernel 5.16.11, kernel 5.17 Doc Type: If docs needed, set a value
Doc Text:
A use-after-free vulnerability in the Linux kernel's SCSI driver was resolved. This flaw occurred when a sas_task was aborted before I/O completion. The issue stemmed from the task being freed by the upper layer after the completion notification complete(), while the driver still accessed the task.
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Description OSIDB Bzimport 2024-07-16 12:26:18 UTC 
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.