linux-kernel - Re: [PATCH 7/7] staging: r8188eu: check firmware header existence before access

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Date:   Thu, 14 Apr 2022 10:40:23 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Michael Straube <straube.linux@...il.com>,
        gregkh@...uxfoundation.org
Cc:     phil@...lpotter.co.uk, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] staging: r8188eu: check firmware header existence
 before access

On 4/14/22 03:38, Michael Straube wrote:
> We should access the fields of fwhdr only if the check for firmware
> header existence is true. Move the affected code into the if block
> that checks firmware header existence.
> 
> Signed-off-by: Michael Straube <straube.linux@...il.com>
> ---
> Do we need the IS_FW_HEADER_EXIST(fwhdr) check at all?
> The header _does_ exist in rtl8188eufw.bin and it's very
> unlikely that it ever changes _and_ the header will be
> removed.
> 
>   drivers/staging/r8188eu/core/rtw_fw.c | 9 ++++-----
>   1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/staging/r8188eu/core/rtw_fw.c b/drivers/staging/r8188eu/core/rtw_fw.c
> index 64963507a346..c58bce1a1856 100644
> --- a/drivers/staging/r8188eu/core/rtw_fw.c
> +++ b/drivers/staging/r8188eu/core/rtw_fw.c
> @@ -249,14 +249,13 @@ int rtl8188e_firmware_download(struct adapter *padapter)
>   	fw_data = dvobj->firmware.data;
>   	fw_size = dvobj->firmware.size;
>   
> -	/*  To Check Fw header. Added by tynli. 2009.12.04. */
>   	fwhdr = (struct rt_firmware_hdr *)dvobj->firmware.data;
>   
> -	pr_info("%sFirmware Version %d, SubVersion %d, Signature 0x%x\n",
> -		DRIVER_PREFIX, le16_to_cpu(fwhdr->version), fwhdr->subversion,
> -		le16_to_cpu(fwhdr->signature));
> -
>   	if (IS_FW_HEADER_EXIST(fwhdr)) {
> +		pr_info("%sFirmware Version %d, SubVersion %d, Signature 0x%x\n",
> +			DRIVER_PREFIX, le16_to_cpu(fwhdr->version), fwhdr->subversion,
> +			le16_to_cpu(fwhdr->signature));
> +
>   		fw_data = fw_data + sizeof(struct rt_firmware_hdr);
>   		fw_size = fw_size - sizeof(struct rt_firmware_hdr);
>   	}

You can probably remove the IS_FW_HEADER_EXIST macro, but please restore the 
guard against logging the version more than once.

Larry