linux-kernel - Re: [PATCH] staging: r8188eu: fix a gcc warning

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Date:   Tue, 19 Oct 2021 22:13:09 +0200
From:   Martin Kaiser <lists@...ser.cx>
To:     Michael Straube <straube.linux@...il.com>
Cc:     gregkh@...uxfoundation.org, Larry.Finger@...inger.net,
        phil@...lpotter.co.uk, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: r8188eu: fix a gcc warning

Thus wrote Michael Straube (straube.linux@...il.com):

> Replace strncpy with strlcpy to fix the following gcc warning.

> drivers/staging/r8188eu/os_dep/ioctl_linux.c: In function 'rtw_wx_set_enc_ext':
> drivers/staging/r8188eu/os_dep/ioctl_linux.c:1929:9: warning: 'strncpy' specified bound 16 equals destination size [-Wstringop-truncation]
>  1929 |         strncpy((char *)param->u.crypt.alg, alg_name, IEEE_CRYPT_ALG_NAME_LEN);
>       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

> The destination buffer size is IEEE_CRYPT_ALG_NAME_LEN and the length
> of the string to copy is always < IEEE_CRYPT_ALG_NAME_LEN. So strlcpy
> will never truncate the string.

> Signed-off-by: Michael Straube <straube.linux@...il.com>
> ---
>  drivers/staging/r8188eu/os_dep/ioctl_linux.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

> diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
> index 51f46696a593..4f0ae821d193 100644
> --- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c
> +++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
> @@ -1926,7 +1926,7 @@ static int rtw_wx_set_enc_ext(struct net_device *dev,
>  		return -1;
>  	}

> -	strncpy((char *)param->u.crypt.alg, alg_name, IEEE_CRYPT_ALG_NAME_LEN);
> +	strlcpy((char *)param->u.crypt.alg, alg_name, IEEE_CRYPT_ALG_NAME_LEN);

>  	if (pext->ext_flags & IW_ENCODE_EXT_SET_TX_KEY)
>  		param->u.crypt.set_tx = 1;
> -- 
> 2.33.0

Hi Michael,

it's too late for another ack as Greg has already taken the patch.

Anyway, thanks for fixing the mess I created with my Makefile patches.

   Martin