linux-kernel - Re: [PATCH v2 1/1] mm: fix vma->anon_name memory leak for anonymous shmem VMAs

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Message-ID: <02312607-e399-b859-ffc8-ea65a560fe3f@redhat.com>
Date:   Thu, 5 Jan 2023 13:18:38 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Holger Hoffstätte <holger@...lied-asynchrony.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     hughd@...gle.com, hannes@...xchg.org, vincent.whitchurch@...s.com,
        seanjc@...gle.com, rppt@...nel.org, shy828301@...il.com,
        pasha.tatashin@...een.com, paul.gortmaker@...driver.com,
        peterx@...hat.com, vbabka@...e.cz, Liam.Howlett@...cle.com,
        ccross@...gle.com, willy@...radead.org, arnd@...db.de,
        cgel.zte@...il.com, yuzhao@...gle.com, bagasdotme@...il.com,
        suleiman@...gle.com, steven@...uorix.net, heftig@...hlinux.org,
        cuigaosheng1@...wei.com, kirill@...temov.name,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org,
        syzbot+91edf9178386a07d06a7@...kaller.appspotmail.com
Subject: Re: [PATCH v2 1/1] mm: fix vma->anon_name memory leak for anonymous
 shmem VMAs

On 05.01.23 13:07, Holger Hoffstätte wrote:
> On 2023-01-05 10:03, David Hildenbrand wrote:
>> On 05.01.23 03:39, Suren Baghdasaryan wrote:
>>> On Wed, Jan 4, 2023 at 5:38 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>>>>
>>>> On Wed,  4 Jan 2023 16:02:40 -0800 Suren Baghdasaryan <surenb@...gle.com> wrote:
>>>>
>>>>> free_anon_vma_name() is missing a check for anonymous shmem VMA which
>>>>> leads to a memory leak due to refcount not being dropped.  Fix this by
>>>>> calling anon_vma_name_put() unconditionally. It will free vma->anon_name
>>>>> whenever it's non-NULL.
>>>>>
>>>>> Fixes: d09e8ca6cb93 ("mm: anonymous shared memory naming")
>>>>
>>>> A cc:stable is appropriate here, yes?
>>>
>>> Hmm. The patch we are fixing here was merged in 6.2-rc1. Should I CC
>>> stable to fix the previous -rc branch?
>>>
>>
>> No need for stable if it's not in a release kernel yet.
> 
> Commit d09e8ca6cb93 is in 6.1. The fix applies cleanly.

$ git tag --contains d09e8ca6cb93 | grep "^v"
v6.2-rc1
v6.2-rc2

Doesn't look like 6.1 to me.

-- 
Thanks,

David / dhildenb