From: Miaohe Lin linmiaohe@huawei.com
commit da9a298f5fad0dc615079a340da42928bc5b138e upstream.
When alloc_huge_page fails, *pagep is set to NULL without put_page first. So the hugepage indicated by *pagep is leaked.
Link: https://lkml.kernel.org/r/20220709092629.54291-1-linmiaohe@huawei.com Fixes: 8cc5fcbb5be8 ("mm, hugetlb: fix racy resv_huge_pages underflow on UFFDIO_COPY") Signed-off-by: Miaohe Lin linmiaohe@huawei.com Acked-by: Muchun Song songmuchun@bytedance.com Reviewed-by: Anshuman Khandual anshuman.khandual@arm.com Reviewed-by: Baolin Wang baolin.wang@linux.alibaba.com Reviewed-by: Mike Kravetz mike.kravetz@oracle.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- mm/hugetlb.c | 1 + 1 file changed, 1 insertion(+)
--- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -5822,6 +5822,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_s
page = alloc_huge_page(dst_vma, dst_addr, 0); if (IS_ERR(page)) { + put_page(*pagep); ret = -ENOMEM; *pagep = NULL; goto out;