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

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Message-ID: <20110904135740.GD3461@thunk.org>
Date:	Sun, 4 Sep 2011 09:57:40 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Tao Ma <tm@....ma>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Fix a possible corruption in dx_probe.

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?

						- Ted
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