linux-kernel - Re: [PATCH v7 3/3] Staging: zram: Fix variable dereferenced before check

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Message-ID: <20131030023523.GC17013@bbox>
Date:	Wed, 30 Oct 2013 11:35:23 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Rashika Kheria <rashika.kheria@...il.com>
Cc:	opw-kernel@...glegroups.com,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	Nitin Gupta <ngupta@...are.org>,
	Jerome Marchand <jmarchand@...hat.com>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v7 3/3] Staging: zram: Fix variable dereferenced before
 check

On Wed, Oct 30, 2013 at 04:45:24AM +0530, Rashika Kheria wrote:
> This patch fixes the following Smatch warning in zram_drv.c-
> drivers/staging/zram/zram_drv.c:899
> destroy_device() warn: variable dereferenced before check 'zram->disk' (see line 896)
> 
> Cc: stable@...r.kernel.org

It shouldn't be a stable stuff because it's just warning of Smatch
but there is no bug in real practice.

> Acked-by: Minchan Kim <minchan@...nel.org>
> Signed-off-by: Rashika Kheria <rashika.kheria@...il.com>
> ---
>  drivers/staging/zram/zram_drv.c |    9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
> index 592e760..bf28d56 100644
> --- a/drivers/staging/zram/zram_drv.c
> +++ b/drivers/staging/zram/zram_drv.c
> @@ -901,13 +901,10 @@ static void destroy_device(struct zram *zram)
>  	sysfs_remove_group(&disk_to_dev(zram->disk)->kobj,
>  			&zram_disk_attr_group);
>  
> -	if (zram->disk) {
> -		del_gendisk(zram->disk);
> -		put_disk(zram->disk);
> -	}
> +	del_gendisk(zram->disk);
> +	put_disk(zram->disk);
>  
> -	if (zram->queue)
> -		blk_cleanup_queue(zram->queue);
> +	blk_cleanup_queue(zram->queue);
>  }
>  
>  static int __init zram_init(void)
> -- 
> 1.7.9.5
> 
> --
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-- 
Kind regards,
Minchan Kim
--
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