linux-kernel - Re: [PATCH] net: wireless: brcm80211: brcmfmac: dhd_sdio.c: Cleaning up missing null-terminate in conjunction with strncpy

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Message-ID: <543A36A0.8090300@broadcom.com>
Date:	Sun, 12 Oct 2014 10:06:56 +0200
From:	Arend van Spriel <arend@...adcom.com>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
CC:	Brett Rudley <brudley@...adcom.com>,
	Hante Meuleman <meuleman@...adcom.com>,
	"John W. Linville" <linville@...driver.com>,
	Pieter-Paul Giesberts <pieterpg@...adcom.com>,
	Daniel Kim <dekim@...adcom.com>,
	<linux-wireless@...r.kernel.org>,
	<brcm80211-dev-list@...adcom.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: wireless: brcm80211: brcmfmac: dhd_sdio.c:  Cleaning
 up missing null-terminate in conjunction with strncpy

On 12-10-14 01:52, Rickard Strandqvist wrote:
> Replacing strncpy with strlcpy to avoid strings that lacks null terminate.
> And changed from using strncpy to strlcpy to simplify code.

Looks good to me. Just two small process related remarks:

- It is sufficient to prefix the patch with brcmfmac (skip net:...).
- Send the patch to the wireless maintainer, ie. John Linville.

Acked-by: Arend van Spriel <arend@...adcom.com>
> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
> ---
>  drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c |   25 ++++++++++----------
>  1 file changed, 12 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c b/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
> index f55f625..d20d4e6 100644
> --- a/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
> +++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
> @@ -670,7 +670,6 @@ static int brcmf_sdio_get_fwnames(struct brcmf_chip *ci,
>  				  struct brcmf_sdio_dev *sdiodev)
>  {
>  	int i;
> -	uint fw_len, nv_len;
>  	char end;
>  
>  	for (i = 0; i < ARRAY_SIZE(brcmf_fwname_data); i++) {
> @@ -684,25 +683,25 @@ static int brcmf_sdio_get_fwnames(struct brcmf_chip *ci,
>  		return -ENODEV;
>  	}
>  
> -	fw_len = sizeof(sdiodev->fw_name) - 1;
> -	nv_len = sizeof(sdiodev->nvram_name) - 1;
>  	/* check if firmware path is provided by module parameter */
>  	if (brcmf_firmware_path[0] != '\0') {
> -		strncpy(sdiodev->fw_name, brcmf_firmware_path, fw_len);
> -		strncpy(sdiodev->nvram_name, brcmf_firmware_path, nv_len);
> -		fw_len -= strlen(sdiodev->fw_name);
> -		nv_len -= strlen(sdiodev->nvram_name);
> +		strlcpy(sdiodev->fw_name, brcmf_firmware_path,
> +			sizeof(sdiodev->fw_name));
> +		strlcpy(sdiodev->nvram_name, brcmf_firmware_path,
> +			sizeof(sdiodev->nvram_name));
>  
>  		end = brcmf_firmware_path[strlen(brcmf_firmware_path) - 1];
>  		if (end != '/') {
> -			strncat(sdiodev->fw_name, "/", fw_len);
> -			strncat(sdiodev->nvram_name, "/", nv_len);
> -			fw_len--;
> -			nv_len--;
> +			strlcat(sdiodev->fw_name, "/",
> +				sizeof(sdiodev->fw_name));
> +			strlcat(sdiodev->nvram_name, "/",
> +				sizeof(sdiodev->nvram_name));
>  		}
>  	}
> -	strncat(sdiodev->fw_name, brcmf_fwname_data[i].bin, fw_len);
> -	strncat(sdiodev->nvram_name, brcmf_fwname_data[i].nv, nv_len);
> +	strlcat(sdiodev->fw_name, brcmf_fwname_data[i].bin,
> +		sizeof(sdiodev->fw_name));
> +	strlcat(sdiodev->nvram_name, brcmf_fwname_data[i].nv,
> +		sizeof(sdiodev->nvram_name));
>  
>  	return 0;
>  }
> 

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