linux-kernel - Re: [PATCH] mm: fix refcounting in swapon

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Message-ID: <20110224145503.GP7840@htj.dyndns.org>
Date:	Thu, 24 Feb 2011 15:55:03 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	rjw@...k.pl, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: fix refcounting in swapon

On Thu, Feb 24, 2011 at 03:49:53PM +0100, Miklos Szeredi wrote:
> From: Miklos Szeredi <mszeredi@...e.cz>
> 
> Grab a reference to bdev before calling blkdev_get(), which expects
> the refcount to be already incremented and either returns success or
> decrements the refcount and returns an error.
> 
> The bug was introduced by e525fd89 (block: make blkdev_get/put()
> handle exclusive access), which didn't take into account this behavior
> of blkdev_get().
> 
> CC: Tejun Heo <tj@...nel.org>
> Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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