From: Zi Yan ziy@nvidia.com
When dealing with hugetlb pages, manipulating struct page pointers directly can get to wrong struct page, since struct page is not guaranteed to be contiguous on SPARSEMEM without VMEMMAP. Use nth_page() to handle it properly.
Fixes: 57a196a58421 ("hugetlb: simplify hugetlb handling in follow_page_mask") Cc: stable@vger.kernel.org Signed-off-by: Zi Yan ziy@nvidia.com Reviewed-by: Muchun Song songmuchun@bytedance.com --- mm/hugetlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 2e7188876672..2521cc694fd4 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -6489,7 +6489,7 @@ struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma, } }
- page += ((address & ~huge_page_mask(h)) >> PAGE_SHIFT); + page = nth_page(page, ((address & ~huge_page_mask(h)) >> PAGE_SHIFT));
/* * Note that page may be a sub-page, and with vmemmap