linux-kernel - Re: [PATCH 4/6] staging: erofs: avoid loop in submit chains

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Message-ID: <24eacd62-3da1-e6cf-8166-43049dbedcf2@kernel.org>
Date:   Mon, 19 Aug 2019 22:50:18 +0800
From:   Chao Yu <chao@...nel.org>
To:     Gao Xiang <gaoxiang25@...wei.com>, Chao Yu <yuchao0@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, linux-fsdevel@...r.kernel.org
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-erofs@...ts.ozlabs.org,
        Miao Xie <miaoxie@...wei.com>, weidu.du@...wei.com,
        Fang Wei <fangwei1@...wei.com>
Subject: Re: [PATCH 4/6] staging: erofs: avoid loop in submit chains

On 2019-8-19 18:34, Gao Xiang wrote:
> As reported by erofs-utils fuzzer, 2 conditions
> can happen in corrupted images, which can cause
> unexpected behaviors.
>  - access the same pcluster one more time;
>  - access the tail end pcluster again, e.g.
>             _ access again (will trigger tail merging)
>            |
>      1 2 3 1 2             ->   1 2 3 1
>      |_ tail end of the chain    \___/ (unexpected behavior)
> Let's detect and avoid them now.
> 
> Signed-off-by: Gao Xiang <gaoxiang25@...wei.com>

Reviewed-by: Chao Yu <yuchao0@...wei.com>

Thanks,