linux-kernel - [PATCH 2/6] kobject: check for duplicate names in kobject

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Date:	Tue, 30 Oct 2007 22:11:41 -0700
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	David Miller <davem@...emloft.net>,
	Kay Sievers <kay.sievers@...y.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Tejun Heo <htejun@...il.com>
Subject: [PATCH 2/6] kobject: check for duplicate names in kobject_rename

This should catch any duplicate names before we try to tell sysfs to
rename the object.  This happens a lot with older versions of udev and
the network rename scripts.

Cc: David Miller <davem@...emloft.net>
Cc: Kay Sievers <kay.sievers@...y.org>
Cc: Rafael J. Wysocki <rjw@...k.pl>
Cc: Tejun Heo <htejun@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 lib/kobject.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/lib/kobject.c b/lib/kobject.c
index 03d4036..a7e3bf4 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -308,6 +308,19 @@ int kobject_rename(struct kobject * kobj, const char *new_name)
 	if (!kobj->parent)
 		return -EINVAL;
 
+	/* see if this name is already in use */
+	if (kobj->kset) {
+		struct kobject *temp_kobj;
+		temp_kobj = kset_find_obj(kobj->kset, new_name);
+		if (temp_kobj) {
+			printk(KERN_WARNING "kobject '%s' can not be renamed "
+			       "to '%s' as '%s' is already in existance.\n",
+			       kobject_name(kobj), new_name, new_name);
+			kobject_put(temp_kobj);
+			return -EINVAL;
+		}
+	}
+
 	devpath = kobject_get_path(kobj, GFP_KERNEL);
 	if (!devpath) {
 		error = -ENOMEM;
-- 
1.5.3.4

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