Bug 2295915

Summary: kernel: From NVD collector
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: CLOSED DUPLICATE QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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Last Closed: 2024-07-05 21:24:22 UTC Type: ---
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Description OSIDB Bzimport 2024-07-05 09:21:42 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mm/hugetlb: do not call vma_add_reservation upon ENOMEM

sysbot reported a splat [1] on __unmap_hugepage_range().  This is because
vma_needs_reservation() can return -ENOMEM if
allocate_file_region_entries() fails to allocate the file_region struct
for the reservation.

Check for that and do not call vma_add_reservation() if that is the case,
otherwise region_abort() and region_del() will see that we do not have any
file_regions.

If we detect that vma_needs_reservation() returned -ENOMEM, we clear the
hugetlb_restore_reserve flag as if this reservation was still consumed, so
free_huge_folio() will not increment the resv count.

[1] https://lore.kernel.org/linux-mm/0000000000004096100617c58d54@google.com/T/#ma5983bc1ab18a54910da83416b3f89f3c7ee43aa
Comment 1 Mauro Matteo Cascella 2024-07-05 21:24:22 UTC 

*** This bug has been marked as a duplicate of bug 2296063 ***