linux-kernel - RE: [PATCH] net: can: usb: peak_usb: pcan_usb_core.c: Cleaning up missing null-terminate in conjunction with strncpy

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Date:	Mon, 15 Sep 2014 08:28:26 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Rickard Strandqvist' <rickard_strandqvist@...ctrumdigital.se>,
	"Wolfgang Grandegger" <wg@...ndegger.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>
CC:	Oliver Hartkopp <socketcan@...tkopp.net>,
	Stephane Grosjean <s.grosjean@...k-system.com>,
	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	"Christopher R. Baker" <cbaker@....ri.cmu.edu>,
	"linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] net: can: usb: peak_usb: pcan_usb_core.c:  Cleaning up
 missing null-terminate in conjunction with strncpy

From: Rickard Strandqvist
...
> Replacing strncpy with strlcpy to avoid strings that lacks null terminate.
...
> diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.c
> b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
> index 644e6ab..d4fe8ac 100644
> --- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c
> +++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
> @@ -830,7 +830,7 @@ static void peak_usb_disconnect(struct usb_interface *intf)
>  		char name[IFNAMSIZ];
> 
>  		dev->state &= ~PCAN_USB_STATE_CONNECTED;
> -		strncpy(name, netdev->name, IFNAMSIZ);
> +		strlcpy(name, netdev->name, IFNAMSIZ);
> 
>  		unregister_netdev(netdev);
>  		free_candev(netdev);

Or:
	char name[sizeof netdev->name];
	memcpy(name, netdev->name, sizeof netdev->name);

	David



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