linux-kernel - Re: [PATCH V6 01/20] platform/x86/intel/vsec: Fix xa

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Date:   Thu, 30 Nov 2023 13:02:24 +0200 (EET)
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 V6 01/20] platform/x86/intel/vsec: Fix xa_alloc memory
 leak

On Wed, 29 Nov 2023, David E. Box wrote:

> Commit 936874b77dd0 ("platform/x86/intel/vsec: Add PCI error recovery
> support to Intel PMT") added an xarray to track the list of vsec devices to
> be recovered after a PCI error. But it did not provide cleanup for the list
> leading to a memory leak that was caught by kmemleak.  Do xa_alloc() before
> devm_add_action_or_reset() so that the list may be cleaned up with
> xa_erase() in the release function.
> 
> Fixes: 936874b77dd0 ("platform/x86/intel/vsec: Add PCI error recovery support to Intel PMT")
> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> ---
> 
> V6 - Move xa_alloc() before ida_alloc() to reduce mutex use during error
>      recovery.
>    - Fix return value after id_alloc() fail
>    - Add Fixes tag
>    - Add more detail to changelog
> 
> V5 - New patch
> 
>  drivers/platform/x86/intel/vsec.c | 24 ++++++++++++++----------
>  drivers/platform/x86/intel/vsec.h |  1 +
>  2 files changed, 15 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
> index c1f9e4471b28..2d568466b4e2 100644
> --- a/drivers/platform/x86/intel/vsec.c
> +++ b/drivers/platform/x86/intel/vsec.c
> @@ -120,6 +120,8 @@ static void intel_vsec_dev_release(struct device *dev)
>  {
>  	struct intel_vsec_device *intel_vsec_dev = dev_to_ivdev(dev);
>  
> +	xa_erase(&auxdev_array, intel_vsec_dev->id);
> +
>  	mutex_lock(&vsec_ida_lock);
>  	ida_free(intel_vsec_dev->ida, intel_vsec_dev->auxdev.id);
>  	mutex_unlock(&vsec_ida_lock);
> @@ -135,19 +137,27 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
>  	struct auxiliary_device *auxdev = &intel_vsec_dev->auxdev;
>  	int ret, id;
>  
> -	mutex_lock(&vsec_ida_lock);
> -	ret = ida_alloc(intel_vsec_dev->ida, GFP_KERNEL);
> -	mutex_unlock(&vsec_ida_lock);
> +	ret = xa_alloc(&auxdev_array, &intel_vsec_dev->id, intel_vsec_dev,
> +		       PMT_XA_LIMIT, GFP_KERNEL);
>  	if (ret < 0) {
>  		kfree(intel_vsec_dev->resource);
>  		kfree(intel_vsec_dev);
>  		return ret;
>  	}
>  
> +	mutex_lock(&vsec_ida_lock);
> +	id = ida_alloc(intel_vsec_dev->ida, GFP_KERNEL);
> +	mutex_unlock(&vsec_ida_lock);
> +	if (id < 0) {
> +		kfree(intel_vsec_dev->resource);
> +		kfree(intel_vsec_dev);
> +		return id;

Thanks, this looks much better this way around but it is missing 
xa_alloc() rollback now that the order is reversed.

Once that is fixed,

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>


-- 
 i.