linux-kernel - [PATCH] lib/kobject: restore old name when rename failure

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Message-Id: <1341473689-2987-1-git-send-email-haodong@linux.vnet.ibm.com>
Date:	Thu,  5 Jul 2012 15:34:49 +0800
From:	Dong Hao <haodong@...ux.vnet.ibm.com>
To:	gregkh@...uxfoundation.org
Cc:	linux-kernel@...r.kernel.org, Hao Dong <haodong@...ux.vnet.ibm.com>
Subject: [PATCH] lib/kobject: restore old name when rename failure

From: Hao Dong <haodong@...ux.vnet.ibm.com>

Function kobject_set_name_vargs() was implemented to rename the
existing kobject. That depends on kvasprintf(), which might return
NULL. So it's possible the kobject name becomes NULL and in that case we
would lose the old name.

The patch restores the old name when kvasprintf() returns NULL.

Signed-off-by: Dong Hao<haodong@...ux.vnet.ibm.com>
---
 lib/kobject.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/kobject.c b/lib/kobject.c
index e07ee1f..c6e201a 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -220,8 +220,10 @@ int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
 		return 0;
 
 	kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs);
-	if (!kobj->name)
+	if (!kobj->name) {
+		kobj->name = old_name;
 		return -ENOMEM;
+	}
 
 	/* ewww... some of these buggers have '/' in the name ... */
 	while ((s = strchr(kobj->name, '/')))
-- 
1.7.9.5

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