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    Subject[PATCH 01/32] kasan: check KASAN_NO_FREE_META in __kasan_metadata_size
    Date
    From: Andrey Konovalov <andreyknvl@google.com>

    __kasan_metadata_size() calculates the size of the redzone for objects
    in a slab cache.

    When accounting for presence of kasan_free_meta in the redzone, this
    function only compares free_meta_offset with 0. But free_meta_offset could
    also be equal to KASAN_NO_FREE_META, which indicates that kasan_free_meta
    is not present at all.

    Add a comparison with KASAN_NO_FREE_META into __kasan_metadata_size().

    Signed-off-by: Andrey Konovalov <andreyknvl@google.com>

    ---

    This is a minor fix that only affects slub_debug runs, so it is probably
    not worth backporting.
    ---
    mm/kasan/common.c | 5 +++--
    1 file changed, 3 insertions(+), 2 deletions(-)

    diff --git a/mm/kasan/common.c b/mm/kasan/common.c
    index c40c0e7b3b5f..968d2365d8c1 100644
    --- a/mm/kasan/common.c
    +++ b/mm/kasan/common.c
    @@ -223,8 +223,9 @@ size_t __kasan_metadata_size(struct kmem_cache *cache)
    return 0;
    return (cache->kasan_info.alloc_meta_offset ?
    sizeof(struct kasan_alloc_meta) : 0) +
    - (cache->kasan_info.free_meta_offset ?
    - sizeof(struct kasan_free_meta) : 0);
    + ((cache->kasan_info.free_meta_offset &&
    + cache->kasan_info.free_meta_offset != KASAN_NO_FREE_META) ?
    + sizeof(struct kasan_free_meta) : 0);
    }

    struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache,
    --
    2.25.1
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