On Sat, 13 Nov 2021 22:44:10 +0700 Bui Quang Minh <minhquangbui99@xxxxxxxxx> wrote: > When hugetlb_vm_op_open() is called during copy_vma(), we may take the > reference to resv_map->css. Later, when clearing the reservation pointer > of old_vma after transferring it to new_vma, we forget to drop the > reference to resv_map->css. This leads to a reference leak of css. > > Fixes this by adding a check to drop reservation css reference in > clear_vma_resv_huge_pages() Thanks. I added cc:stable to this (550a7d60bd5e35a was merged a year ago) and I've queued it for 5.16-rc2, pending suitable reviewer feedback.
