linux-kernel - Re: [PATCH v2 1/1] fpga: m10bmc-sec: Fix probe rollback

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Message-ID: <Y6kZfHOCb18qmaeP@yilunxu-OptiPlex-7050>
Date:   Mon, 26 Dec 2022 11:48:12 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     Russ Weight <russell.h.weight@...el.com>,
        Moritz Fischer <mdf@...nel.org>, Wu Hao <hao.wu@...el.com>,
        Tom Rix <trix@...hat.com>, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Matthew Gerlach <matthew.gerlach@...ux.intel.com>,
        Marco Pagani <marpagan@...hat.com>
Subject: Re: [PATCH v2 1/1] fpga: m10bmc-sec: Fix probe rollback

On 2022-12-14 at 16:49:52 +0200, Ilpo Järvinen wrote:
> Handle probe error rollbacks properly to avoid leaks.
> 
> Fixes: 5cd339b370e2 ("fpga: m10bmc-sec: add max10 secure update functions")
> Reviewed-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> Reviewed-by: Russ Weight <russell.h.weight@...el.com>
> Reviewed-by: Marco Pagani <marpagan@...hat.com>
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

I assume this should be in stable kernel, so
 
 Cc: stable@...r.kernel.org

If OK, I could add it myself.

Thanks,
Yilun

> ---
> I don't know if the previous one fell through cracks so resending this.
> 
> v2:
> - Resending v1 with Marco's Rev-by
> 
>  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)
> -- 
> 2.30.2
>