From: Minchan Kim <minchan@kernel.org>
To: Rashika Kheria <rashika.kheria@gmail.com>
Cc: opw-kernel@googlegroups.com,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiang Liu <jiang.liu@huawei.com>, Nitin Gupta <ngupta@vflare.org>,
Jerome Marchand <jmarchand@redhat.com>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH v7 3/3] Staging: zram: Fix variable dereferenced before check
Date: Wed, 30 Oct 2013 11:35:23 +0900 [thread overview]
Message-ID: <20131030023523.GC17013@bbox> (raw)
In-Reply-To: <a40fc8ee88e324a8f5ee5c79750e160b5c16288c.1383087326.git.rashika.kheria@gmail.com>
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@vger.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@kernel.org>
> Signed-off-by: Rashika Kheria <rashika.kheria@gmail.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
next prev parent reply other threads:[~2013-10-30 2:35 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20131019110539.GA25167@gmail.com>
2013-10-29 23:10 ` [PATCH v7 1/3] Staging: zram: Fix access of NULL pointer Rashika Kheria
2013-10-29 23:12 ` [PATCH v7 2/3] Staging: zram: Fix decrement of variable by calling bdput() Rashika Kheria
2013-10-30 2:33 ` Minchan Kim
2013-10-29 23:15 ` [PATCH v7 3/3] Staging: zram: Fix variable dereferenced before check Rashika Kheria
2013-10-30 2:35 ` Minchan Kim [this message]
2013-10-30 10:44 ` Jerome Marchand
2013-10-30 2:24 ` [PATCH v7 1/3] Staging: zram: Fix access of NULL pointer Minchan Kim
2013-10-30 2:36 ` Minchan Kim
2013-10-30 10:42 ` Jerome Marchand
2013-10-30 13:06 ` [PATCH v8 " Rashika Kheria
2013-10-30 13:10 ` [PATCH v8 2/3] Staging: zram: Fix decrement of variable by calling bdput() Rashika Kheria
2013-10-31 9:42 ` Weijie Yang
2013-10-31 11:56 ` [PATCH v9 1/2] Staging: zram: Fix access of NULL pointer Rashika Kheria
2013-10-31 11:58 ` [PATCH v9 2/2] Staging: zram: Fix decrement of variable by calling bdput() Rashika Kheria
2013-11-01 2:00 ` Minchan Kim
2013-11-01 8:54 ` Jerome Marchand
2013-11-01 14:13 ` Rashika Kheria
2013-11-01 14:06 ` [PATCH v10] Staging: zram: Fix memory leak by refcount mismatch Rashika Kheria
2013-11-10 15:45 ` Greg Kroah-Hartman
2013-11-10 15:56 ` [OPW kernel] " Rashika Kheria
2013-11-10 16:10 ` Greg Kroah-Hartman
2013-11-10 16:14 ` Rashika Kheria
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