binder: free memory on error

On binder_init() the devices string is duplicated and smashed into individual
device names which are passed along. However, the original duplicated string
wasn't freed in case binder_init() failed. Let's free it on error.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/android/binder.c

@@ -5237,7 +5237,7 @@ static int __init init_binder_device(const char *name)
 static int __init binder_init(void)
 {
 	int ret;
-	char *device_name, *device_names;
+	char *device_name, *device_names, *device_tmp;
 	struct binder_device *device;
 	struct hlist_node *tmp;
 
@@ -5288,7 +5288,8 @@ static int __init binder_init(void)
 	}
 	strcpy(device_names, binder_devices_param);
 
-	while ((device_name = strsep(&device_names, ","))) {
+	device_tmp = device_names;
+	while ((device_name = strsep(&device_tmp, ","))) {
 		ret = init_binder_device(device_name);
 		if (ret)
 			goto err_init_binder_device_failed;
@@ -5302,6 +5303,9 @@ static int __init binder_init(void)
 		hlist_del(&device->hlist);
 		kfree(device);
 	}
+
+	kfree(device_names);
+
 err_alloc_device_names_failed:
 	debugfs_remove_recursive(binder_debugfs_dir_entry_root);