netdev - Re: [PATCH] Bluetooth: hidp: using strlcpy or strcpy instead of strncpy

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Message-ID: <CANq1E4SmY+CD0uf53_b6GeFkQ-LYnpdxsDGSRMWdn2i1mnb6WQ@mail.gmail.com>
Date:	Tue, 7 May 2013 21:31:50 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Marcel Holtmann <marcel@...tmann.org>,
	Gustavo Padovan <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	David Miller <davem@...emloft.net>,
	Jiri Kosina <jkosina@...e.cz>, andrei.emeltchenko@...el.com,
	"linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] Bluetooth: hidp: using strlcpy or strcpy instead of strncpy

Hi

On Tue, May 7, 2013 at 3:50 PM, Chen Gang <gang.chen@...anux.com> wrote:
>
> For NUL terminated string, need always let it ended by zero.
>
> Since have already called memcpy() to initialize 'ci', so need not
> redundent initializations.
>
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  net/bluetooth/hidp/core.c |   10 +++-------
>  1 files changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
> index 940f5ac..9a8ae63 100644
> --- a/net/bluetooth/hidp/core.c
> +++ b/net/bluetooth/hidp/core.c
> @@ -76,25 +76,21 @@ static void hidp_copy_session(struct hidp_session *session, struct hidp_conninfo
>         ci->flags = session->flags;
>         ci->state = BT_CONNECTED;
>
> -       ci->vendor  = 0x0000;
> -       ci->product = 0x0000;
> -       ci->version = 0x0000;
> -
>         if (session->input) {
>                 ci->vendor  = session->input->id.vendor;
>                 ci->product = session->input->id.product;
>                 ci->version = session->input->id.version;
>                 if (session->input->name)
> -                       strncpy(ci->name, session->input->name, 128);
> +                       strlcpy(ci->name, session->input->name, 128);
>                 else
> -                       strncpy(ci->name, "HID Boot Device", 128);
> +                       strcpy(ci->name, "HID Boot Device");

I'd actually prefer strlcpy() here, too (better be safe). Other than
that the patch looks fine.

Reviewed-by: David Herrmann <dh.herrmann@...il.com>

Regards
David

>         }
>
>         if (session->hid) {
>                 ci->vendor  = session->hid->vendor;
>                 ci->product = session->hid->product;
>                 ci->version = session->hid->version;
> -               strncpy(ci->name, session->hid->name, 128);
> +               strlcpy(ci->name, session->hid->name, 128);
>         }
>  }
>
> --
> 1.7.7.6
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