From: Chris Mason <chris.mason@oracle.com>
To: Li Zefan <lizf@cn.fujitsu.com>
Cc: "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>,
Juan Francisco Cantero Hurtado <iam@juanfra.info>
Subject: Re: [PATCH 2/2] Btrfs: Avoid accessing unmapped kernel address
Date: Wed, 16 Feb 2011 21:05:38 -0500 [thread overview]
Message-ID: <1297908324-sup-3306@think> (raw)
In-Reply-To: <4D5B6971.2040006@cn.fujitsu.com>
Excerpts from Li Zefan's message of 2011-02-16 01:06:41 -0500:
> When decompressing a chunk of data, we'll copy the data out to
> a working buffer if the data is stored in more than one page,
> otherwise we'll use the mapped page directly to avoid memory
> copy.
>
> In the latter case, we'll end up accessing the kernel address
> after we've unmapped the page in a corner case.
Great, thanks I've got this running here now.
-chris
prev parent reply other threads:[~2011-02-17 2:05 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-16 6:06 [PATCH 2/2] Btrfs: Avoid accessing unmapped kernel address Li Zefan
2011-02-17 2:05 ` Chris Mason [this message]
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