linux-kernel - Re: [PATCH V3 03/16] platform/x86/intel/vsec: Use cleanup.h

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Message-ID: <114e1cc4-f129-b6cd-a83b-7d822cde178@linux.intel.com>
Date:   Thu, 12 Oct 2023 17:46:49 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     "David E. Box" <david.e.box@...ux.intel.com>
cc:     LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org, rajvi.jingar@...ux.intel.com
Subject: Re: [PATCH V3 03/16] platform/x86/intel/vsec: Use cleanup.h

On Wed, 11 Oct 2023, David E. Box wrote:

> Use cleanup.h helpers to handle cleanup of resources in
> intel_vsec_add_dev() after failures.
> 
> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> ---
> V3 - New patch.
> 
>  drivers/platform/x86/intel/vsec.c | 17 ++++++++++-------
>  1 file changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
> index 15866b7d3117..f03ab89ab7c0 100644
> --- a/drivers/platform/x86/intel/vsec.c
> +++ b/drivers/platform/x86/intel/vsec.c
> @@ -15,6 +15,7 @@
>  
>  #include <linux/auxiliary_bus.h>
>  #include <linux/bits.h>
> +#include <linux/cleanup.h>
>  #include <linux/delay.h>
>  #include <linux/kernel.h>
>  #include <linux/idr.h>
> @@ -155,10 +156,10 @@ EXPORT_SYMBOL_NS_GPL(intel_vsec_add_aux, INTEL_VSEC);
>  static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *header,
>  			      struct intel_vsec_platform_info *info)
>  {
> -	struct intel_vsec_device *intel_vsec_dev;
> +	struct intel_vsec_device __free(kfree) *intel_vsec_dev = NULL;
>  	struct resource *res, *tmp;
>  	unsigned long quirks = info->quirks;
> -	int i;
> +	int ret, i;
>  
>  	if (!intel_vsec_supported(header->id, info->caps))
>  		return -EINVAL;
> @@ -178,10 +179,8 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
>  		return -ENOMEM;
>  
>  	res = kcalloc(header->num_entries, sizeof(*res), GFP_KERNEL);
> -	if (!res) {
> -		kfree(intel_vsec_dev);
> +	if (!res)
>  		return -ENOMEM;
> -	}
>  
>  	if (quirks & VSEC_QUIRK_TABLE_SHIFT)
>  		header->offset >>= TABLE_OFFSET_SHIFT;
> @@ -208,8 +207,12 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
>  	else
>  		intel_vsec_dev->ida = &intel_vsec_ida;
>  
> -	return intel_vsec_add_aux(pdev, NULL, intel_vsec_dev,
> -				  intel_vsec_name(header->id));
> +	ret = intel_vsec_add_aux(pdev, NULL, intel_vsec_dev,
> +				 intel_vsec_name(header->id));
> +
> +	no_free_ptr(intel_vsec_dev);
> +
> +	return ret;

So if intel_vsec_add_aux() returned an error, intel_vsec_dev won't be 
freed because of the call call to no_free_ptr() before return. I that's 
not what you intended?

-- 
 i.