linux-kernel - Re: [PATCH v3 RESEND] staging: erofs: fix an error handling in erofs

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Date:   Sun, 18 Aug 2019 20:29:53 +0800
From:   Chao Yu <chao@...nel.org>
To:     Gao Xiang <hsiangkao@....com>, Chao Yu <yuchao0@...wei.com>,
        Richard Weinberger <richard@....at>,
        Matthew Wilcox <willy@...radead.org>,
        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>, Fang Wei <fangwei1@...wei.com>,
        Gao Xiang <gaoxiang25@...wei.com>, stable@...r.kernel.org
Subject: Re: [PATCH v3 RESEND] staging: erofs: fix an error handling in
 erofs_readdir()

On 2019-8-18 11:21, Gao Xiang wrote:
> From: Gao Xiang <gaoxiang25@...wei.com>
> 
> Richard observed a forever loop of erofs_read_raw_page() [1]
> which can be generated by forcely setting ->u.i_blkaddr
> to 0xdeadbeef (as my understanding block layer can
> handle access beyond end of device correctly).
> 
> After digging into that, it seems the problem is highly
> related with directories and then I found the root cause
> is an improper error handling in erofs_readdir().
> 
> Let's fix it now.
> 
> [1] https://lore.kernel.org/r/1163995781.68824.1566084358245.JavaMail.zimbra@nod.at/
> 
> Reported-by: Richard Weinberger <richard@....at>
> Fixes: 3aa8ec716e52 ("staging: erofs: add directory operations")
> Cc: <stable@...r.kernel.org> # 4.19+
> Signed-off-by: Gao Xiang <gaoxiang25@...wei.com>

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

Thanks,