linux-kernel - Re: [-mm3 PATCH] (Retry) Check the return value of kobject

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Message-ID: <20070402130128.707c8c19@gondolin.boeblingen.de.ibm.com>
Date:	Mon, 2 Apr 2007 13:01:28 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	"Cong WANG" <xiyou.wangcong@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	viro@...iv.linux.org.uk
Subject: Re: [-mm3 PATCH] (Retry) Check the return value of kobject_add and
 etc.

On Sun, 1 Apr 2007 15:32:34 +0800,
"Cong WANG" <xiyou.wangcong@...il.com> wrote:

> --- linux-2.6.21-rc5-mm3/fs/partitions/check.c.orig	2007-03-30
> 21:35:45.000000000 +0800
> +++ linux-2.6.21-rc5-mm3/fs/partitions/check.c	2007-03-30
> 21:49:53.000000000 +0800
> @@ -385,10 +385,16 @@ void add_partition(struct gendisk *disk,
>  	p->kobj.parent = &disk->kobj;
>  	p->kobj.ktype = &ktype_part;
>  	kobject_init(&p->kobj);
> -	kobject_add(&p->kobj);
> +	if (kobject_add(&p->kobj)) {
> +		kfree(p);
> +		return;
> +	}
>  	if (!disk->part_uevent_suppress)
>  		kobject_uevent(&p->kobj, KOBJ_ADD);
> -	sysfs_create_link(&p->kobj, &block_subsys.kset.kobj, "subsystem");
> +	if (sysfs_create_link(&p->kobj, &block_subsys.kset.kobj, "subsystem")) {
> +		kfree(p);
> +		return;
> +	}

You need to properly undo whatever you did before. You're missing a
KOBJ_DEL uevent and a kobject_del here.

>  	if (flags & ADDPART_FLAG_WHOLEDISK) {
>  		static struct attribute addpartattr = {
>  			.name = "whole_disk",
> @@ -396,7 +402,10 @@ void add_partition(struct gendisk *disk,
>  			.owner = THIS_MODULE,
>  		};
> 
> -		sysfs_create_file(&p->kobj, &addpartattr);
> +		if (sysfs_create_file(&p->kobj, &addpartattr)) {
> +			kfree(p);
> +			return;
> +		}

Also here.
-
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