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Code Issues Releases Wiki Activity

hugetlb: fix memoryleak in hugetlb_mcopy_atomic_pte 

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: 8cc5fcbb5b ("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>
This commit is contained in:
Miaohe Lin 2022-07-09 17:26:29 +08:00 committed by akpm
parent bdeb77bc2c
commit da9a298f5f
1 changed files with 1 additions and 0 deletions
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1
mm/hugetlb.c
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@ -5952,6 +5952,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
page = alloc_huge_page(dst_vma, dst_addr, 0);
if (IS_ERR(page)) {
put_page(*pagep);
ret = -ENOMEM;
*pagep = NULL;
goto out;