linux-kernel - Re: [PATCH 5.10 48/76] platform/x86: intel_pmc_core: fix memleak on registration failure

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Date:   Fri, 31 Dec 2021 11:04:05 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Johan Hovold <johan@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH 5.10 48/76] platform/x86: intel_pmc_core: fix memleak on
 registration failure

Hi!

On Mon 2021-12-27 16:31:03, Greg Kroah-Hartman wrote:
> From: Johan Hovold <johan@...nel.org>
> 
> commit 26a8b09437804fabfb1db080d676b96c0de68e7c upstream.
> 
> In case device registration fails during module initialisation, the
> platform device structure needs to be freed using platform_device_put()
> to properly free all resources (e.g. the device name).
>

Does it? What exactly was leaking here?

> +++ b/drivers/platform/x86/intel_pmc_core_pltdrv.c
> @@ -65,7 +65,7 @@ static int __init pmc_core_platform_init
>  
>  	retval = platform_device_register(pmc_core_device);
>  	if (retval)
> -		kfree(pmc_core_device);
> +		platform_device_put(pmc_core_device);
>  

This is strange. Failing registration should have no effects that need
to be undone.

Best regards,
								Pavel
-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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