]> www.infradead.org Git - users/jedix/linux-maple.git/commit
mm/migration: fix potential pte_unmap on an not mapped pte
authorMiaohe Lin <linmiaohe@huawei.com>
Mon, 30 May 2022 11:30:16 +0000 (19:30 +0800)
committerLiam R. Howlett <Liam.Howlett@oracle.com>
Wed, 20 Jul 2022 00:15:01 +0000 (20:15 -0400)
commit6de4f7d24a484558e1a9b3d8e3d633342da79852
tree42f97e330c4818c17402282827566f24cd48a59f
parentee1f7ab360d1f3c8ecb957f28a2b0ccd8758228d
mm/migration: fix potential pte_unmap on an not mapped pte

__migration_entry_wait and migration_entry_wait_on_locked assume pte is
always mapped from caller.  But this is not the case when it's called from
migration_entry_wait_huge and follow_huge_pmd.  Add a hugetlbfs variant
that calls hugetlb_migration_entry_wait(ptep == NULL) to fix this issue.

Link: https://lkml.kernel.org/r/20220530113016.16663-5-linmiaohe@huawei.com
Fixes: 30dad30922cc ("mm: migration: add migrate_entry_wait_huge()")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Suggested-by: David Hildenbrand <david@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
include/linux/swapops.h
mm/hugetlb.c
mm/migrate.c