kobject: fix memory leak in kobject_set_name_vargs

If the call to kvasprintf fails then the old name of the object will be leaked,
this patch fixes the bug by restoring the old name before returning ENOMEM.

Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/kobject.c b/lib/kobject.c
index 98b45bb33c8d..94b321f4ac67 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -265,8 +265,10 @@ 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, '/')))