* [merged mm-hotfixes-stable] mm-mmap-undo-mmap-when-mas_preallocate-fails.patch removed from -mm tree
@ 2022-10-21 4:34 Andrew Morton
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From: Andrew Morton @ 2022-10-21 4:34 UTC (permalink / raw)
To: mm-commits, songmuchun, lukas.bulwahn, Liam.Howlett, cmllamas,
catalin.marinas, andrii, mike.kravetz, akpm
The quilt patch titled
Subject: mm/mmap: undo ->mmap() when mas_preallocate() fails
has been removed from the -mm tree. Its filename was
mm-mmap-undo-mmap-when-mas_preallocate-fails.patch
This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Mike Kravetz <mike.kravetz@oracle.com>
Subject: mm/mmap: undo ->mmap() when mas_preallocate() fails
Date: Mon, 17 Oct 2022 19:49:45 -0700
A memory leak in hugetlb_reserve_pages was reported in [1]. The root
cause was traced to an error path in mmap_region when mas_preallocate()
fails. In this case, the vma is freed after a successful call to
filesystem specific mmap. The hugetlbfs mmap routine may allocate data
structures pointed to by m_private_data. These need to be cleaned up by
the hugetlb vm_ops->close() routine.
The same issue was addressed by commit deb0f6562884 ("mm/mmap: undo
->mmap() when arch_validate_flags() fails") for the arch_validate_flags()
test. Go to the same close_and_free_vma label if mas_preallocate() fails.
[1] https://lore.kernel.org/linux-mm/CAKXUXMxf7OiCwbxib7MwfR4M1b5+b3cNTU7n5NV9Zm4967=FPQ@mail.gmail.com/
Link: https://lkml.kernel.org/r/20221018024945.415036-1-mike.kravetz@oracle.com
Fixes: d4af56c5c7c6 ("mm: start tracking VMAs with maple tree")
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reported-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Carlos Llamas <cmllamas@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/mmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/mmap.c~mm-mmap-undo-mmap-when-mas_preallocate-fails
+++ a/mm/mmap.c
@@ -2681,7 +2681,7 @@ cannot_expand:
if (mas_preallocate(&mas, vma, GFP_KERNEL)) {
error = -ENOMEM;
if (file)
- goto unmap_and_free_vma;
+ goto close_and_free_vma;
else
goto free_vma;
}
_
Patches currently in -mm which might be from mike.kravetz@oracle.com are
hugetlb-simplify-hugetlb-handling-in-follow_page_mask.patch
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2022-10-21 4:34 [merged mm-hotfixes-stable] mm-mmap-undo-mmap-when-mas_preallocate-fails.patch removed from -mm tree Andrew Morton
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