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Subject: Re: [PATCH] mm: fix dereference a null pointer in
 migrate[_huge]_page_move_mapping()
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        stable@vger.kernel.org
References: <20220217063808.42018-1-liqiong@nfschina.com>
 <Yg35UXjB7RpqVCOI@kroah.com>
From:   =?UTF-8?B?5p2O5Yqb55C8?= <liqiong@nfschina.com>
Message-ID: <64157952-22d7-b21b-1b08-c784b8eed1fe@nfschina.com>
Date:   Thu, 17 Feb 2022 15:59:21 +0800
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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