Re: [PATCH] hugetlbfs: avoid overflow in hugetlbfs_fallocate

[Matthew Wilcox <willy@xxxxxxxxxxxxx>]

On Wed, Nov 24, 2021 at 12:08:18PM +0800, yangerkun wrote:
>  	start = offset >> hpage_shift;
> -	end = (offset + len + hpage_size - 1) >> hpage_shift;
> +	end = ((unsigned long long)offset + len + hpage_size - 1)
> +		>> hpage_shift;

+	end = DIV_ROUND_UP_ULL(offset + len, hpage_size);