linux-kernel - Re: [PATCH v3] zram: fix possible use after free in zcomp

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Date:	Tue, 8 Sep 2015 22:35:49 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Luis Henriques <luis.henriques@...onical.com>
Cc:	Nitin Gupta <ngupta@...are.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3] zram: fix possible use after free in zcomp_create()

On Tue, Sep 08, 2015 at 10:39:28AM +0100, Luis Henriques wrote:
> zcomp_create() verifies the success of zcomp_strm_{multi,siggle}_create()
> through comp->stream, which can potentially be pointing to memory that was
> freed if these functions returned an error.
> 
> While at it, replace a 'ERR_PTR(-ENOMEM)' by a more generic
> 'ERR_PTR(error)' as in the future zcomp_strm_{multi,siggle}_create() could
> return other error codes.  Function documentation updated accordingly.
> 
> Fixes: beca3ec71fe5 ("zram: add multi stream functionality")
> Cc: stable@...r.kernel.org
> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
> Cc: Minchan Kim <minchan@...nel.org>
> Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
Acked-by: Minchan Kim <minchan@...nel.org>

Thanks for the fix!
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