On Fri 13-01-17 11:26:08, Dan Carpenter wrote:
> kunmap_atomic() and kunmap() take different pointers. People often get
> these mixed up.
>
> Fixes: 16374db2e9a0 ("userfaultfd: hugetlbfs: fix __mcopy_atomic_hugetlb retry/error processing")
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
> ---
> v2: I was also unmapping the wrong pointer because I had a typo.
>
> diff --git a/mm/memory.c b/mm/memory.c
> index 6012a05..aca8ef6 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -4172,7 +4172,7 @@ long copy_huge_page_from_user(struct page *dst_page,
> (const void __user *)(src + i * PAGE_SIZE),
> PAGE_SIZE);
> if (allow_pagefault)
> - kunmap(page_kaddr);
> + kunmap(page_kaddr + i);
> else
> kunmap_atomic(page_kaddr);
>
--
Michal Hocko
SUSE Labs
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