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List:       linux-fpga
Subject:    Re: [PATCH 1/1] fpga: m10bmc-sec: Fix probe rollback
From:       Marco Pagani <marpagan () redhat ! com>
Date:       2022-11-30 17:20:31
Message-ID: 0f28f75d-ac27-1f3d-2531-6b0f7504db85 () redhat ! com
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On 2022-11-30 10:11, Ilpo Järvinen wrote:
> Handle probe error rollbacks properly to avoid leaks.
> 
> Fixes: 5cd339b370e2 ("fpga: m10bmc-sec: add max10 secure update functions")

Reviewed-by: Marco Pagani <marpagan@redhat.com>

> Reviewed-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> Reviewed-by: Russ Weight <russell.h.weight@intel.com>
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
> ---
>  drivers/fpga/intel-m10-bmc-sec-update.c | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/fpga/intel-m10-bmc-sec-update.c b/drivers/fpga/intel-m10-bmc-sec-update.c
> index 79d48852825e..03f1bd81c434 100644
> --- a/drivers/fpga/intel-m10-bmc-sec-update.c
> +++ b/drivers/fpga/intel-m10-bmc-sec-update.c
> @@ -574,20 +574,27 @@ static int m10bmc_sec_probe(struct platform_device *pdev)
>  	len = scnprintf(buf, SEC_UPDATE_LEN_MAX, "secure-update%d",
>  			sec->fw_name_id);
>  	sec->fw_name = kmemdup_nul(buf, len, GFP_KERNEL);
> -	if (!sec->fw_name)
> -		return -ENOMEM;
> +	if (!sec->fw_name) {
> +		ret = -ENOMEM;
> +		goto fw_name_fail;
> +	}
>  
>  	fwl = firmware_upload_register(THIS_MODULE, sec->dev, sec->fw_name,
>  				       &m10bmc_ops, sec);
>  	if (IS_ERR(fwl)) {
>  		dev_err(sec->dev, "Firmware Upload driver failed to start\n");
> -		kfree(sec->fw_name);
> -		xa_erase(&fw_upload_xa, sec->fw_name_id);
> -		return PTR_ERR(fwl);
> +		ret = PTR_ERR(fwl);
> +		goto fw_uploader_fail;
>  	}
>  
>  	sec->fwl = fwl;
>  	return 0;
> +
> +fw_uploader_fail:
> +	kfree(sec->fw_name);
> +fw_name_fail:
> +	xa_erase(&fw_upload_xa, sec->fw_name_id);
> +	return ret;
>  }
>  
>  static int m10bmc_sec_remove(struct platform_device *pdev)

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