Re: [PATCH] mm: hugetlb: fix dissolve_free_huge_page use of tail/head page

[Oscar Salvador]

On Thu, May 27, 2021 at 04:12:25PM -0700, Mike Kravetz wrote:
> The routine dissolve_free_huge_page can be passed the tail page of a
> hugetlb page.  The tail page is incorrectly passed on to the routines
> alloc_huge_page_vmemmap and add_hugetlb_page which expect a hugetlb
> head page.
> 
> Operating on a tail page instead of head page could result in addressing
> exceptions or vmemmap corruption.
> 
> Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>

I guess Andrew will squash the changes, but fwiw:

Reviewed-by: Oscar Salvador <osalvador@xxxxxxx>


-- 
Oscar Salvador
SUSE L3