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-rw-r--r--mm/hugetlb.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 23ef240ba48a..31d00eee028f 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -7044,9 +7044,13 @@ long hugetlb_change_protection(struct vm_area_struct *vma,
if (!pte_same(pte, newpte))
set_huge_pte_at(mm, address, ptep, newpte, psize);
} else if (unlikely(is_pte_marker(pte))) {
- /* No other markers apply for now. */
- WARN_ON_ONCE(!pte_marker_uffd_wp(pte));
- if (uffd_wp_resolve)
+ /*
+ * Do nothing on a poison marker; page is
+ * corrupted, permissons do not apply. Here
+ * pte_marker_uffd_wp()==true implies !poison
+ * because they're mutual exclusive.
+ */
+ if (pte_marker_uffd_wp(pte) && uffd_wp_resolve)
/* Safe to modify directly (non-present->none). */
huge_pte_clear(mm, address, ptep, psize);
} else if (!huge_pte_none(pte)) {