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| author | Zi Yan <ziy@nvidia.com> | 2023-09-13 22:12:47 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-10-04 19:32:29 +0200 |
| commit | 8db0ec791f7788cd21e7f91ee5ff42c1c458d0e7 (patch) | |
| tree | b3785e94b17152afa828497619f1f069e46718a9 /lib/radix-tree.c | |
| parent | mm/memory_hotplug: use pfn math in place of direct struct page manipulation (diff) | |
| download | linux-8db0ec791f7788cd21e7f91ee5ff42c1c458d0e7.tar.xz linux-8db0ec791f7788cd21e7f91ee5ff42c1c458d0e7.zip | |
fs: use nth_page() in place of direct struct page manipulation
When dealing with hugetlb pages, struct page is not guaranteed to be
contiguous on SPARSEMEM without VMEMMAP. Use nth_page() to handle it
properly.
Without the fix, a wrong subpage might be checked for HWPoison, causing wrong
number of bytes of a page copied to user space. No bug is reported. The fix
comes from code inspection.
Link: https://lkml.kernel.org/r/20230913201248.452081-5-zi.yan@sent.com
Fixes: 38c1ddbde6c6 ("hugetlbfs: improve read HWPOISON hugepage")
Signed-off-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'lib/radix-tree.c')
0 files changed, 0 insertions, 0 deletions