linux-kernel - Re: [PATCH] memory: brcmstb

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Date:   Thu, 20 Aug 2020 17:29:44 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Alex Dewar <alex.dewar90@...il.com>
Cc:     Markus Mayer <mmayer@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memory: brcmstb_dpfe: Fix memory leak

On Tue, Aug 18, 2020 at 12:02:01PM +0100, Alex Dewar wrote:
> In brcmstb_dpfe_download_firmware(), memory is allocated to variable fw by
> firmware_request_nowarn(), but never released. Fix up to release fw on
> all return paths.
> 
> Signed-off-by: Alex Dewar <alex.dewar90@...il.com>
> ---
>  drivers/memory/brcmstb_dpfe.c | 18 +++++++++++-------
>  1 file changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/memory/brcmstb_dpfe.c b/drivers/memory/brcmstb_dpfe.c
> index 60e8633b1175..f24a9dc65f3c 100644
> --- a/drivers/memory/brcmstb_dpfe.c
> +++ b/drivers/memory/brcmstb_dpfe.c
> @@ -616,7 +616,7 @@ static int brcmstb_dpfe_download_firmware(struct brcmstb_dpfe_priv *priv)
>  	const u32 *dmem, *imem;
>  	struct init_data init;
>  	const void *fw_blob;
> -	int ret;
> +	int ret = 0;

This does not look needed. Why initializing it? You cannot jump to
release_fw label or reach it without going through assignment.

Best regards,
Krzysztof

>  
>  	/*
>  	 * Skip downloading the firmware if the DCPU is already running and
> @@ -647,8 +647,10 @@ static int brcmstb_dpfe_download_firmware(struct brcmstb_dpfe_priv *priv)
>  		return (ret == -ENOENT) ? -EPROBE_DEFER : ret;
>  
>  	ret = __verify_firmware(&init, fw);
> -	if (ret)
> -		return -EFAULT;
> +	if (ret) {
> +		ret = -EFAULT;
> +		goto release_fw;
> +	}
>  
>  	__disable_dcpu(priv);
>  
> @@ -667,18 +669,20 @@ static int brcmstb_dpfe_download_firmware(struct brcmstb_dpfe_priv *priv)
>  
>  	ret = __write_firmware(priv->dmem, dmem, dmem_size, is_big_endian);
>  	if (ret)
> -		return ret;
> +		goto release_fw;
>  	ret = __write_firmware(priv->imem, imem, imem_size, is_big_endian);
>  	if (ret)
> -		return ret;
> +		goto release_fw;
>  
>  	ret = __verify_fw_checksum(&init, priv, header, init.chksum);
>  	if (ret)
> -		return ret;
> +		goto release_fw;
>  
>  	__enable_dcpu(priv);
>  
> -	return 0;
> +release_fw:
> +	release_firmware(fw);
> +	return ret;
>  }
>  
>  static ssize_t generic_show(unsigned int command, u32 response[],
> -- 
> 2.28.0
>