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

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Message-ID: <64157952-22d7-b21b-1b08-c784b8eed1fe@nfschina.com>
Date:   Thu, 17 Feb 2022 15:59:21 +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 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