linux-kernel - [PATCH] edac: Fix reference count leak in edac_device_register_sysfs_main

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Date:   Thu, 28 May 2020 15:35:26 -0500
From:   wu000273@....edu
To:     kjlu@....edu
Cc:     wu000273@....edu, Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        Robert Richter <rrichter@...vell.com>,
        Doug Thompson <dougthompson@...ssion.com>,
        Greg Kroah-Hartman <gregkh@...e.de>,
        linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] edac: Fix reference count leak in edac_device_register_sysfs_main_kobj.

From: Qiushi Wu <wu000273@....edu>

kobject_init_and_add() should be handled when it return an error,
because kobject_init_and_add() takes reference even when it fails.
If this function returns an error, kobject_put() must be called to
properly clean up the memory associated with the object. Previous
commit "b8eb718348b8" fixed a similar problem.

Fixes: b2ed215a3338 ("Kobject: change drivers/edac to use kobject_init_and_add")
Signed-off-by: Qiushi Wu <wu000273@....edu>
---
 drivers/edac/edac_device_sysfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/edac/edac_device_sysfs.c b/drivers/edac/edac_device_sysfs.c
index 0e7ea3591b78..5e7593753799 100644
--- a/drivers/edac/edac_device_sysfs.c
+++ b/drivers/edac/edac_device_sysfs.c
@@ -275,6 +275,7 @@ int edac_device_register_sysfs_main_kobj(struct edac_device_ctl_info *edac_dev)
 
 	/* Error exit stack */
 err_kobj_reg:
+	kobject_put(&edac_dev->kobj);
 	module_put(edac_dev->owner);
 
 err_out:
-- 
2.17.1