linux-kernel - [PATCH v6 2/3] Staging: zram: Fix variable dereferenced before check

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Date:	Mon, 28 Oct 2013 17:53:40 +0530
From:	Rashika Kheria <rashika.kheria@...il.com>
To:	opw-kernel@...glegroups.com,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Minchan Kim <minchan@...nel.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	Nitin Gupta <ngupta@...are.org>,
	Jerome Marchand <jmarchand@...hat.com>,
	linux-kernel@...r.kernel.org
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 <rashika.kheria@...il.com>
---

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

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