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

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Message-ID: <20140728190009.GB3769@osiris>
Date:	Mon, 28 Jul 2014 21:00:09 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>, linux390@...ibm.com,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] s390: char: sclp_async.c:  Cleaning up missing
 null-terminate in conjunction with strncpy

On Sat, Jul 26, 2014 at 04:30:47PM +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/char/sclp_async.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/s390/char/sclp_async.c b/drivers/s390/char/sclp_async.c
> index 5f9f929..585de0a 100644
> --- a/drivers/s390/char/sclp_async.c
> +++ b/drivers/s390/char/sclp_async.c
> @@ -132,12 +132,12 @@ static int sclp_async_send_wait(char *message)
>  	request->command = SCLP_CMDW_WRITE_EVENT_DATA;
>  	request->sccb = sccb;
>  	request->status = SCLP_REQ_FILLED;
> -	strncpy(sccb->evbuf.data, message, sizeof(sccb->evbuf.data));
> +	strlcpy(sccb->evbuf.data, message, sizeof(sccb->evbuf.data));

Do your patches actually fix any bugs? E.g. this line fills a hardware data
structure, which must not necessarily be null terminated. Actually you even
could have introduced a bug here.
So, please state which of your patches actually do fix bugs.

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