linux-kernel - [PATCH 4.9 017/128] ACPI: CPPC: Fix reference count leak in acpi_cppc_processor

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Message-Id: <20200619141621.066742251@linuxfoundation.org>
Date:   Fri, 19 Jun 2020 16:31:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Qiushi Wu <wu000273@....edu>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 4.9 017/128] ACPI: CPPC: Fix reference count leak in acpi_cppc_processor_probe()

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

commit 4d8be4bc94f74bb7d096e1c2e44457b530d5a170 upstream.

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: 158c998ea44b ("ACPI / CPPC: add sysfs support to compute delivered performance")
Signed-off-by: Qiushi Wu <wu000273@....edu>
Cc: 4.10+ <stable@...r.kernel.org> # 4.10+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/acpi/cppc_acpi.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -793,8 +793,10 @@ int acpi_cppc_processor_probe(struct acp

 	ret = kobject_init_and_add(&cpc_ptr->kobj, &cppc_ktype, &cpu_dev->kobj,
 			"acpi_cppc");
-	if (ret)
+	if (ret) {
+		kobject_put(&cpc_ptr->kobj);
 		goto out_free;
+	}

 	kfree(output.pointer);
 	return 0;