linux-kernel - Re: [PATCH v2] staging: erofs: keep corrupted fs from crashing kernel in erofs

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Message-ID: <20190215075757.GG2326@kadam>
Date:   Fri, 15 Feb 2019 10:57:57 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     Gao Xiang <gaoxiang25@...wei.com>,
        Al Viro <viro@...IV.linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, linux-erofs@...ts.ozlabs.org,
        Chao Yu <chao@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        stable@...r.kernel.org, weidu.du@...wei.com,
        Fang Wei <fangwei1@...wei.com>, Miao Xie <miaoxie@...wei.com>
Subject: Re: [PATCH v2] staging: erofs: keep corrupted fs from crashing
 kernel in erofs_namei()

On Fri, Feb 15, 2019 at 03:02:25PM +0800, Chao Yu wrote:
> On 2019/2/1 20:16, Gao Xiang wrote:
> > +	/*
> > +	 * on-disk error, let's only BUG_ON in the debugging mode.
> > +	 * otherwise, it will return 1 to just skip the invalid name
> > +	 * and go on (in consideration of the lookup performance).
> > +	 */
> > +	DBG_BUGON(qd->name > qd->end);
> 
> qd->name == qd->end is not allowed as well?
> 
> So will it be better to return directly here?
> 
> 	if (unlikely(qd->name >= qd->end)) {
> 		DBG_BUGON(1);
> 		return 1;
> 	}

Please don't add likely/unlikely() annotations unless you have
benchmarked it and it makes a difference.

regards,
dan carpenter