linux-kernel - [PATCH v2 1/2] EDAC/device_sysfs: Fix calling kobject_put() with ->state

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Message-ID: <20231128183037.3395755-1-harshit.m.mogalapalli@oracle.com>
Date:   Tue, 28 Nov 2023 10:30:35 -0800
From:   Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To:     Borislav Petkov <bp@...en8.de>, Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Robert Richter <rric@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     dan.carpenter@...aro.org, kernel-janitors@...r.kernel.org,
        error27@...il.com, harshit.m.mogalapalli@...cle.com,
        stable@...r.kernel.org
Subject: [PATCH v2 1/2] EDAC/device_sysfs: Fix calling kobject_put() with ->state_initialized unset

In edac_device_register_sysfs_main_kobj(), when dev_root is NULL,
kobject_init_and_add() is not called.

	if (err) { // err = -ENODEV
		edac_dbg(1, "Failed to register '.../edac/%s'\n",
	                 edac_dev->name);
		goto err_kobj_reg; // This calls kobj_put()
	}

This will cause a runtime warning in kobject_put() if the above happens.
Warning:
"kobject: '%s' (%p): is not initialized, yet kobject_put() is being called."

Fix the error handling to avoid the above possible situation.

Cc: <stable@...r.kernel.org>
Fixes: cb4a0bec0bb9 ("EDAC/sysfs: move to use bus_get_dev_root()")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
---
This is based on static analysis and only compile tested.
v1->v2: Resend as a patchset as they are two similar bugs.
---
 drivers/edac/edac_device_sysfs.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/edac/edac_device_sysfs.c b/drivers/edac/edac_device_sysfs.c
index 010c26be5846..4cac14cbdb60 100644
--- a/drivers/edac/edac_device_sysfs.c
+++ b/drivers/edac/edac_device_sysfs.c
@@ -253,11 +253,13 @@ int edac_device_register_sysfs_main_kobj(struct edac_device_ctl_info *edac_dev)
 
 	/* register */
 	dev_root = bus_get_dev_root(edac_subsys);
-	if (dev_root) {
-		err = kobject_init_and_add(&edac_dev->kobj, &ktype_device_ctrl,
-					   &dev_root->kobj, "%s", edac_dev->name);
-		put_device(dev_root);
-	}
+	if (!dev_root)
+		goto module_put;
+
+	err = kobject_init_and_add(&edac_dev->kobj, &ktype_device_ctrl,
+				   &dev_root->kobj, "%s", edac_dev->name);
+	put_device(dev_root);
+
 	if (err) {
 		edac_dbg(1, "Failed to register '.../edac/%s'\n",
 			 edac_dev->name);
@@ -276,8 +278,8 @@ 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:
 	module_put(edac_dev->owner);
-
 err_out:
 	return err;
 }
-- 
2.42.0