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

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Date: Tue, 2 Jan 2024 13:37:50 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: Markus Elfring <Markus.Elfring@....de>,
 platform-driver-x86@...r.kernel.org, kernel-janitors@...r.kernel.org,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Shyam Sundar S K <Shyam-sundar.S-k@....com>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] platform/x86/amd/pmf: Return directly after a failed
 apmf_if_call() in apmf_sbios_heartbeat_notify()

Hi,

On 12/28/23 09:42, Markus Elfring wrote:
> 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>

Thank you for your patch, I've applied this patch to my review-hans 
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans



> ---
>  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
> 
>