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Message-ID: <20230131142452.sfrmubta4ojejct2@revolver>
Date: Tue, 31 Jan 2023 09:24:52 -0500
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: maple-tree@...ts.infradead.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
linux-next@...r.kernel.org,
Sanan Hasanov <sanan.hasanov@...ghts.ucf.edu>,
Matthew Wilcox <willy@...radead.org>,
Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH] mm/mmap: Fix vma_merge() offset when expanding the next
vma
* David Hildenbrand <david@...hat.com> [230131 03:35]:
> On 30.01.23 20:57, Liam R. Howlett wrote:
> > The vm_pgoff was being set incorrectly when expanding the next VMA to a
> > lower address. Fix the issue by using the mid->vm_pgoff value for this
> > merge case (aka case 8). Note that this does not change case 3's
> > vm_pgoff as next and mid are the same VMA.
> >
> > Reported-by: Sanan Hasanov <sanan.hasanov@...ghts.ucf.edu>
> > Link: https://lore.kernel.org/linux-mm/IA1PR07MB983017D2FBA174D2FF78CEB6ABCE9@IA1PR07MB9830.namprd07.prod.outlook.com/
> > Cc: Matthew Wilcox <willy@...radead.org>
> > Cc: David Hildenbrand <david@...hat.com>
> > Cc: Hugh Dickins <hughd@...gle.com>
>
> Fixes: ?
Fixes: (soon to be invalid git id :) ("mm/mmap: remove __vma_adjust()")
>
> > Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
> > ---
> > mm/mmap.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/mm/mmap.c b/mm/mmap.c
> > index 00d90bbc250e..614ea2d93b0a 100644
> > --- a/mm/mmap.c
> > +++ b/mm/mmap.c
> > @@ -978,7 +978,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
> > vma = next; /* case 3 */
> > vma_start = addr;
> > vma_end = next->vm_end;
> > - vma_pgoff = next->vm_pgoff;
> > + vma_pgoff = mid->vm_pgoff;
> > err = 0;
> > if (mid != next) { /* case 8 */
> > remove = mid;
>
> Acked-by: David Hildenbrand <david@...hat.com>
>
> Thanks!
>
> --
> Thanks,
>
> David / dhildenb
>
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