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
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Thu, 19 Dec 2024 10:15:00 +0000
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Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-05-11T20:21:18.722Z
Reserved: 2024-06-25T14:23:23.746Z
Link: CVE-2024-39477
Updated: 2024-08-02T04:26:15.943Z
Status : Modified
Published: 2024-07-05T07:15:10.413
Modified: 2024-11-21T09:27:45.047
Link: CVE-2024-39477
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