ALSA: hda: fix potential memleak in 'add_widget_node'

As 'kobject_add' may allocated memory for 'kobject->name' when return error.
And in this function, if call 'kobject_add' failed didn't free kobject.
So call 'kobject_put' to recycling resources.

Signed-off-by: Ye Bin <yebin10@huawei.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20221110144539.2989354-1-yebin@huaweicloud.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/hda/hdac_sysfs.c b/sound/hda/hdac_sysfs.c
index e47de49..62a9615 100644 (file)
--- a/sound/hda/hdac_sysfs.c
+++ b/sound/hda/hdac_sysfs.c
@@ -346,8 +346,10 @@ static int add_widget_node(struct kobject *parent, hda_nid_t nid,
                return -ENOMEM;
        kobject_init(kobj, &widget_ktype);
        err = kobject_add(kobj, parent, "%02x", nid);
-       if (err < 0)
+       if (err < 0) {
+               kobject_put(kobj);
                return err;
+       }
        err = sysfs_create_group(kobj, group);
        if (err < 0) {
                kobject_put(kobj);