linux-kernel - Re: [PATCH] mm: fix dereference a null pointer in migrate[_huge]_page_move

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Message-ID: <5ee3d92e-99e4-38ce-aee6-66258398f579@nfschina.com>
Date:   Thu, 17 Feb 2022 16:39:33 +0800
From:   李力琼 <liqiong@...china.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] mm: fix dereference a null pointer in
 migrate[_huge]_page_move_mapping()

Hi Gerg,

Sorry, i may understand your confusion.
I thought 'Upstream' as the newest code, so, I said 'Upstream has no this bug'.

Yes, we found this bug on 'Upstream v4.19.191'.

How could i submit this patch to 'longterm: 4.19'.

Thanks.

**

在 2022/2/17 下午3:59, 李力琼 写道:
> Hi Greg,
>
> Upstream replaces migrate_page_move_mapping() with 
> folio_migrate_mapping(),
> does not use radix tree any more. So, the upstream don't have the null
> pointer bug.
>
> We found and fix this bug on '4.19.191'.
>
> 在 2022/2/17 下午3:29, Greg KH 写道:
>> On Thu, Feb 17, 2022 at 02:38:08PM +0800, liqiong wrote:
>>> Upstream has no this bug.
>> What do you mean by this?
>>
>> confused,
>>
>> greg k-h