2013-10-28 12:23:54

by Rashika Kheria

Subject: [PATCH v6 2/3] Staging: zram: Fix variable dereferenced before check

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)

Signed-off-by: Rashika Kheria <[email protected]>
---

This revision fixes the following issues of the previous revision-
Seperating patches into Bug fix and Smatch fix

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 d640a8f..9027975 100644
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -898,13 +898,10 @@ 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

2013-10-29 00:44:13

by Minchan Kim

Subject: Re: [PATCH v6 2/3] Staging: zram: Fix variable dereferenced before check

On Mon, Oct 28, 2013 at 05:53:40PM +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)
>
> Signed-off-by: Rashika Kheria <[email protected]>
Acked-by: Minchan Kim <[email protected]>

--
Kind regards,
Minchan Kim