Bug 2315194 (CVE-2024-46842)

Summary: CVE-2024-46842 kernel: scsi: lpfc: Handle mailbox timeouts in lpfc_get_sfp_info
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2315264    
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Description OSIDB Bzimport 2024-09-27 13:22:30 UTC 
In the Linux kernel, the following vulnerability has been resolved:

scsi: lpfc: Handle mailbox timeouts in lpfc_get_sfp_info

The MBX_TIMEOUT return code is not handled in lpfc_get_sfp_info and the
routine unconditionally frees submitted mailbox commands regardless of
return status.  The issue is that for MBX_TIMEOUT cases, when firmware
returns SFP information at a later time, that same mailbox memory region
references previously freed memory in its cmpl routine.

Fix by adding checks for the MBX_TIMEOUT return code.  During mailbox
resource cleanup, check the mbox flag to make sure that the wait did not
timeout.  If the MBOX_WAKE flag is not set, then do not free the resources
because it will be freed when firmware completes the mailbox at a later
time in its cmpl routine.

Also, increase the timeout from 30 to 60 seconds to accommodate boot
scripts requiring longer timeouts.
Comment 1 Robb Gatica 2024-09-27 14:55:22 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024092754-CVE-2024-46842-e52c@gregkh/T