linux-kernel - Re: [PATCH] lightnvm: pblk: Fix reference count leak in pblk_sysfs

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Message-ID: <20200528062833.clbghpoqizjvl7g4@mpHalley.localdomain>
Date:   Thu, 28 May 2020 08:28:33 +0200
From:   Javier González <javier@...igon.com>
To:     wu000273@....edu
Cc:     kjlu@....edu, Matias Bjorling <mb@...htnvm.io>,
        Matias Bjørling <matias@...xlabs.com>,
        Jens Axboe <axboe@...com>,
        Javier González <jg@...htnvm.io>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lightnvm: pblk: Fix reference count leak in
 pblk_sysfs_init.

On 27.05.2020 16:06, wu000273@....edu wrote:
>From: Qiushi Wu <wu000273@....edu>
>
>kobject_init_and_add() takes reference even when it fails.
>Thus, when kobject_init_and_add() returns an error,
>kobject_put() must be called to properly clean up the kobject.
>
>Fixes: a4bd217b4326 ("lightnvm: physical block device (pblk) target")
>Signed-off-by: Qiushi Wu <wu000273@....edu>
>---
> drivers/lightnvm/pblk-sysfs.c | 1 +
> 1 file changed, 1 insertion(+)
>
>diff --git a/drivers/lightnvm/pblk-sysfs.c b/drivers/lightnvm/pblk-sysfs.c
>index 6387302b03f2..90f1433b19a2 100644
>--- a/drivers/lightnvm/pblk-sysfs.c
>+++ b/drivers/lightnvm/pblk-sysfs.c
>@@ -711,6 +711,7 @@ int pblk_sysfs_init(struct gendisk *tdisk)
> 					"%s", "pblk");
> 	if (ret) {
> 		pblk_err(pblk, "could not register\n");
>+		kobject_put(&pblk->kobj);
> 		return ret;
> 	}
>
>-- 
>2.17.1
>

Looks good to me.

Reviewed-by: Javier González <javier@...igon.com>