diff mbox series

[v2,2/5] mm/hugetlb: use nth_page() in place of direct struct page manipulation.

Message ID 20230906150309.114360-3-zi.yan@sent.com (mailing list archive)
State New
Headers show
Series Use nth_page() in place of direct struct page manipulation | expand

Commit Message

Zi Yan Sept. 6, 2023, 3:03 p.m. UTC 
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 mbox series

Patch

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