Re: [PATCH v7 3/3] Staging: zram: Fix variable dereferenced beforecheck

[Jerome Marchand]

On 10/30/2013 12:15 AM, 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@xxxxxxxxxxxxxxx
> Acked-by: Minchan Kim <minchan@xxxxxxxxxx>
> Signed-off-by: Rashika Kheria <rashika.kheria@xxxxxxxxx>
Acked-by: Jerome Marchand <jmarchan@xxxxxxxxxx>

> ---
>  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)
> 

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