linux-kernel - Re: [E1000-devel] [PATCH] net: ethernet: intel: ixgbe: ixgbe_main.c: Cleaning up missing null-terminate in conjunction with strncpy

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Date:	Tue, 29 Jul 2014 20:20:44 +0000
From:	"Brown, Aaron F" <aaron.f.brown@...el.com>
To:	"rickard_strandqvist@...ctrumdigital.se" 
	<rickard_strandqvist@...ctrumdigital.se>
CC:	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Ronciak, John" <john.ronciak@...el.com>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>,
	Linux NICS <Linux-nics@...tope.jf.intel.com>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [E1000-devel] [PATCH] net: ethernet: intel: ixgbe:
 ixgbe_main.c: Cleaning up missing null-terminate in conjunction with strncpy

On Tue, 2014-07-29 at 14:15 +0200, Rickard Strandqvist wrote:
> Den 29 jul 2014 04:40 skrev "Stephen Hemminger" <stephen@...workplumber.org
> >:
> >
> > On Sat, 26 Jul 2014 16:24:36 +0200
> > Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se> wrote:
> >
> > > Replacing strncpy with strlcpy to avoid strings that lacks null
> terminate.
> > >
> > > Signed-off-by: Rickard Strandqvist <
> rickard_strandqvist@...ctrumdigital.se>
> > > ---
> >                            hw->mac.type, hw->phy.type, hw->phy.sfp_type,
> >
> > This patch doesn't change anything.
> > Netdev is already zeroed when allocated therefore doing strncpy()
> guarantees
> > it will be null terminated.
> 
> Hi Stephen
> 
> It's not clear that alloc_etherdev_mq() will zero the memory area:
> 
<snip>

Thanks Rickard, given strncpy to strlcpy gets suggested by static code
generators this will probably come up again even if it results in no
real change.  I (covering for Jeff Kirsher) went ahead and added it to
our internal tree.