This is a note to let you know that I've just added the patch titled
hugetlb: fix memoryleak in hugetlb_mcopy_atomic_pte
to the 5.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hugetlb-fix-memoryleak-in-hugetlb_mcopy_atomic_pte.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From da9a298f5fad0dc615079a340da42928bc5b138e Mon Sep 17 00:00:00 2001
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Date: Sat, 9 Jul 2022 17:26:29 +0800
Subject: hugetlb: fix memoryleak in hugetlb_mcopy_atomic_pte
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
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@xxxxxxxxxx
Fixes: 8cc5fcbb5be8 ("mm, hugetlb: fix racy resv_huge_pages underflow on UFFDIO_COPY")
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Acked-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Reviewed-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/hugetlb.c | 1 +
1 file changed, 1 insertion(+)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -5827,6 +5827,7 @@ 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;
Patches currently in stable-queue which might be from linmiaohe@xxxxxxxxxx are
queue-5.18/hugetlb-fix-memoryleak-in-hugetlb_mcopy_atomic_pte.patch
queue-5.18/mm-hugetlb-separate-path-for-hwpoison-entry-in-copy_hugetlb_page_range.patch
