linux-kernel - Re: [PATCH] s390: net: ctcm_main.c: Cleaning up missing null-terminate in conjunction with strncpy

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Date:	Tue, 29 Jul 2014 15:11:03 +0200
From:	Ursula Braun <ubraun@...ux.vnet.ibm.com>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	Ursula Braun <ursula.braun@...ibm.com>,
	Frank Blaschka <blaschka@...ux.vnet.ibm.com>,
	linux390@...ibm.com, Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] s390: net: ctcm_main.c:  Cleaning up missing
 null-terminate in conjunction with strncpy

On Sat, 2014-07-26 at 16:33 +0200, Rickard Strandqvist wrote:
> Replacing strncpy with strlcpy to avoid strings that lacks null terminate.
> 
> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
> ---
>  drivers/s390/net/ctcm_main.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c
> index 03b6ad0..670fa7d 100644
> --- a/drivers/s390/net/ctcm_main.c
> +++ b/drivers/s390/net/ctcm_main.c
> @@ -204,8 +204,8 @@ static void channel_remove(struct channel *ch)
> 
>  	if (ch == NULL)
>  		return;
> -	else
> -		strncpy(chid, ch->id, CTCM_ID_SIZE);
> +
> +	strlcpy(chid, ch->id, CTCM_ID_SIZE);
> 
>  	channel_free(ch);
>  	while (*c) {

It is guaranteed that the string ch->id always fits into CTCM_ID_SIZE.
What's in this case the benefit of replacing strncpy() by strlcpy()
here?

I agree to remove the useless "else".

 

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