linux-ext4 - Re: [PATCH] ext4: Fix a possible corruption in dx

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Date:	Mon, 05 Sep 2011 10:17:52 +0800
From:	Tao Ma <tm@....ma>
To:	Ted Ts'o <tytso@....edu>
CC:	linux-ext4@...r.kernel.org, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH] ext4: Fix a possible corruption in dx_probe.

On 09/04/2011 09:57 PM, Ted Ts'o wrote:
> On Thu, Sep 01, 2011 at 12:00:52AM +0800, Tao Ma wrote:
>> From: Tao Ma <boyu.mt@...bao.com>
>>
>> For all the callers of dx_probe, frame_in is passed in uninitialized.
>> So we should set frame->bh to NULL in the beginning of while, not
>> the end. Otherwise, the first "goto fail2" will try to brelse(frame->bh)
>> while frame->bh is still invalid.
> 
> There's a "frame->bh = NULL" statement at the very beginning of
> dx_probe().   Shouldn't that do the trick?
Oh, sorry for the false alarm.

Thanks
Tao
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