linux-kernel - Re: [PATCH v3 04/10] zram: avoid double free in function zram_bvec

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Message-ID: <20130607080622.GC22516@blaptop>
Date:	Fri, 7 Jun 2013 17:06:22 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Jerome Marchand <jmarchan@...hat.com>,
	Jiang Liu <jiang.liu@...wei.com>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v3 04/10] zram: avoid double free in function
 zram_bvec_write()

On Fri, Jun 07, 2013 at 12:07:25AM +0800, Jiang Liu wrote:
> When doing a patial write and the whole page is filled with zero,
               ^
               partial

> zram_bvec_write() will free uncmem twice.
> 
> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
> Acked-by: Minchan Kim <minchan@...nel.org>
> Cc: stable@...r.kernel.org
> ---
>  drivers/staging/zram/zram_drv.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
> index 2ca6dc9..27ab824 100644
> --- a/drivers/staging/zram/zram_drv.c
> +++ b/drivers/staging/zram/zram_drv.c
> @@ -272,8 +272,6 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
>  
>  	if (page_zero_filled(uncmem)) {
>  		kunmap_atomic(user_mem);
> -		if (is_partial_io(bvec))
> -			kfree(uncmem);
>  		zram->stats.pages_zero++;
>  		zram_set_flag(meta, index, ZRAM_ZERO);
>  		ret = 0;
> -- 
> 1.8.1.2
> 
> --
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-- 
Kind regards,
Minchan Kim
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