linux-kernel - [PATCH AUTOSEL 4.4 1/5] EDAC: Fix reference count leaks

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Date:   Sat,  8 Aug 2020 19:40:49 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Qiushi Wu <wu000273@....edu>, Borislav Petkov <bp@...e.de>,
        Sasha Levin <sashal@...nel.org>, linux-edac@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 1/5] EDAC: Fix reference count leaks

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

[ Upstream commit 17ed808ad243192fb923e4e653c1338d3ba06207 ]

When kobject_init_and_add() returns an error, it should be handled
because kobject_init_and_add() takes a 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.

Therefore, replace calling kfree() and call kobject_put() and add a
missing kobject_put() in the edac_device_register_sysfs_main_kobj()
error path.

 [ bp: Massage and merge into a single patch. ]

Fixes: b2ed215a3338 ("Kobject: change drivers/edac to use kobject_init_and_add")
Signed-off-by: Qiushi Wu <wu000273@....edu>
Signed-off-by: Borislav Petkov <bp@...e.de>
Link: https://lkml.kernel.org/r/20200528202238.18078-1-wu000273@umn.edu
Link: https://lkml.kernel.org/r/20200528203526.20908-1-wu000273@umn.edu
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/edac/edac_device_sysfs.c | 1 +
 drivers/edac/edac_pci_sysfs.c    | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/edac/edac_device_sysfs.c b/drivers/edac/edac_device_sysfs.c
index fb68a06ad6837..18991cfec2af4 100644
--- a/drivers/edac/edac_device_sysfs.c
+++ b/drivers/edac/edac_device_sysfs.c
@@ -280,6 +280,7 @@ 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_mod_get:
diff --git a/drivers/edac/edac_pci_sysfs.c b/drivers/edac/edac_pci_sysfs.c
index 24d877f6e5775..c56128402bc67 100644
--- a/drivers/edac/edac_pci_sysfs.c
+++ b/drivers/edac/edac_pci_sysfs.c
@@ -394,7 +394,7 @@ static int edac_pci_main_kobj_setup(void)
 
 	/* Error unwind statck */
 kobject_init_and_add_fail:
-	kfree(edac_pci_top_main_kobj);
+	kobject_put(edac_pci_top_main_kobj);
 
 kzalloc_fail:
 	module_put(THIS_MODULE);
-- 
2.25.1