linux-kernel - [PATCH] firmware: dmi-sysfs: Add clean-up operations to fix refcount leak

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Date:   Tue,  4 Aug 2020 13:36:49 -0500
From:   James Bond <jameslouisebond@...il.com>
To:     jameslouisebond@...il.com
Cc:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Greg Kroah-Hartman <gregkh@...e.de>,
        Mike Waychison <mikew@...gle.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] firmware: dmi-sysfs: Add clean-up operations to fix refcount leak

According to the documentation of function kobject_init_and_add(),
when this function returns an error, kobject_put() must be called
to properly clean up the memory associated with the object.

Fixes: 925a1da7477f ("firmware: Break out system_event_log in dmi-sysfs")
Signed-off-by: James Bond <jameslouisebond@...il.com>
---
 drivers/firmware/dmi-sysfs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/dmi-sysfs.c b/drivers/firmware/dmi-sysfs.c
index 8b8127fa8955..848b6a0f94eb 100644
--- a/drivers/firmware/dmi-sysfs.c
+++ b/drivers/firmware/dmi-sysfs.c
@@ -457,8 +457,10 @@ static int dmi_system_event_log(struct dmi_sysfs_entry *entry)
 				   &dmi_system_event_log_ktype,
 				   &entry->kobj,
 				   "system_event_log");
-	if (ret)
+	if (ret) {
+		kobject_put(entry->child);
 		goto out_free;
+	}
 
 	ret = sysfs_create_bin_file(entry->child, &dmi_sel_raw_attr);
 	if (ret)
-- 
2.17.1