netdev - Re: [PATCH net-next] octeontx2-pf: Treat truncation of IRQ name as an error

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Message-ID: <20240501201146.GM516117@kernel.org>
Date: Wed, 1 May 2024 21:11:46 +0100
From: Simon Horman <horms@...nel.org>
To: Andrew Lunn <andrew@...n.ch>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Sunil Goutham <sgoutham@...vell.com>,
	Geethasowjanya Akula <gakula@...vell.com>,
	Subbaraya Sundeep <sbhatta@...vell.com>,
	Hariprasad Kelam <hkelam@...vell.com>,
	Dan Carpenter <dan.carpenter@...aro.org>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] octeontx2-pf: Treat truncation of IRQ name as
 an error

On Wed, May 01, 2024 at 09:46:15PM +0200, Andrew Lunn wrote:
> On Wed, May 01, 2024 at 07:27:09PM +0100, Simon Horman wrote:
> > According to GCC, the constriction of irq_name in otx2_open()
> > may, theoretically, be truncated.
> > 
> > This patch takes the approach of treating such a situation as an error
> > which it detects by making use of the return value of snprintf, which is
> > the total number of bytes, including the trailing '\0', that would have
> > been written.
> > +		name_len = snprintf(irq_name, NAME_SIZE, "%s-rxtx-%d",
> > +				    pf->netdev->name, qidx);
> > +		if (name_len >= NAME_SIZE) {
> 
> You say name_len includes the trailing \0. So you should be able to
> get NAME_SIZE bytes into an NAME_SIZE length array? So i think this
> can be >, not >= ?

Sorry, I misspoke.
name_len excludes the trailing \0.

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