linux-kernel - [PATCH] platform/x86/amd/pmf: Return directly after a failed apmf_if_call() in apmf_sbios_heartbeat

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Date: Thu, 28 Dec 2023 09:42:21 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: platform-driver-x86@...r.kernel.org, kernel-janitors@...r.kernel.org,
 Hans de Goede <hdegoede@...hat.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Shyam Sundar S K <Shyam-sundar.S-k@....com>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] platform/x86/amd/pmf: Return directly after a failed
 apmf_if_call() in apmf_sbios_heartbeat_notify()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Thu, 28 Dec 2023 09:30:54 +0100

The kfree() function was called in one case by
the apmf_sbios_heartbeat_notify() function during error handling
even if the passed variable contained a null pointer.
This issue was detected by using the Coccinelle software.

* Thus return directly after a call of the function “apmf_if_call” failed
  at the beginning.

* Delete the label “out” which became unnecessary with this refactoring.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/platform/x86/amd/pmf/acpi.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/platform/x86/amd/pmf/acpi.c b/drivers/platform/x86/amd/pmf/acpi.c
index 4ec7957eb707..eb367e38c5ab 100644
--- a/drivers/platform/x86/amd/pmf/acpi.c
+++ b/drivers/platform/x86/amd/pmf/acpi.c
@@ -135,11 +135,9 @@ static void apmf_sbios_heartbeat_notify(struct work_struct *work)
 	dev_dbg(dev->dev, "Sending heartbeat to SBIOS\n");
 	info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT, NULL);
 	if (!info)
-		goto out;
+		return;

 	schedule_delayed_work(&dev->heart_beat, msecs_to_jiffies(dev->hb_interval * 1000));
-
-out:
 	kfree(info);
 }

--
2.43.0