linux-kernel - Re: [PATCH] md: fix potential OOB in multipath_remove

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Message-ID: <tencent_0EDE0D522DF8161358B80786820BAAA5C406@qq.com>
Date:   Sat, 15 Jul 2023 17:44:53 +0800
From:   Zhang Shurong <zhang_shurong@...mail.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     song@...nel.org, linux-raid@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] md: fix potential OOB in multipath_remove_disk()

在 2023年7月13日星期四 CST 上午12:50:19，Christoph Hellwig 写道：
> On Thu, Jul 13, 2023 at 12:46:05AM +0800, Zhang Shurong wrote:
> > If rddev->raid_disk is greater than mddev->raid_disks, there will be
> > an out-of-bounds in multipath_remove_disk. We have already found
> > similar reports as follows:
> > 
> > 1) commit d17f744e883b ("md-raid10: fix KASAN warning")
> > 2) commit 1ebc2cec0b7d ("dm raid: fix KASAN warning in raid5_remove_disk")
> > 
> > Fix this bug by checking whether the "number" variable is
> > valid.
> 
> I think it might just be time to finally dropped the deprecated md
> multipath code instead..
Should I write another patch to delete them?