Re: [PATCH v3 04/10] zram: avoid double free in functionzram_bvec_write()

[Minchan Kim]

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@xxxxxxxxxx>
> Acked-by: Minchan Kim <minchan@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> ---
>  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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