linux-kernel - [PATCH] qemu_fw_cfg: don't leak kobj on init error

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Message-ID: <1459686193-29414-1-git-send-email-mst@redhat.com>
Date:	Sun, 3 Apr 2016 15:23:19 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Gabriel Somlo <somlo@....edu>,
	Andreas Ziegler <andreas.ziegler@....de>,
	Valentin Rothberg <valentin.rothberg@...teo.net>
Subject: [PATCH] qemu_fw_cfg: don't leak kobj on init error

If platform_driver_register fails, we should
cleanup fw_cfg_top_ko before exiting.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/firmware/qemu_fw_cfg.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/qemu_fw_cfg.c b/drivers/firmware/qemu_fw_cfg.c
index fedbff5..e4c4714 100644
--- a/drivers/firmware/qemu_fw_cfg.c
+++ b/drivers/firmware/qemu_fw_cfg.c
@@ -727,12 +727,18 @@ device_param_cb(mmio, &fw_cfg_cmdline_param_ops, NULL, S_IRUSR);
 
 static int __init fw_cfg_sysfs_init(void)
 {
+	int ret;
+
 	/* create /sys/firmware/qemu_fw_cfg/ top level directory */
 	fw_cfg_top_ko = kobject_create_and_add("qemu_fw_cfg", firmware_kobj);
 	if (!fw_cfg_top_ko)
 		return -ENOMEM;
 
-	return platform_driver_register(&fw_cfg_sysfs_driver);
+	ret = platform_driver_register(&fw_cfg_sysfs_driver);
+	if (ret)
+		fw_cfg_kobj_cleanup(fw_cfg_top_ko);
+
+	return ret;
 }
 
 static void __exit fw_cfg_sysfs_exit(void)
-- 
MST