netdev - Re: [PATCH 80/82] xen-netback: Refactor intentional wrap-around test

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Date: Tue, 23 Jan 2024 13:32:35 -0800
From: Kees Cook <keescook@...omium.org>
To: Jan Beulich <jbeulich@...e.com>
Cc: Wei Liu <wei.liu@...nel.org>, Paul Durrant <paul@....org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	xen-devel@...ts.xenproject.org, netdev@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH 80/82] xen-netback: Refactor intentional wrap-around test

On Tue, Jan 23, 2024 at 08:55:44AM +0100, Jan Beulich wrote:
> On 23.01.2024 01:27, Kees Cook wrote:
> > --- a/drivers/net/xen-netback/hash.c
> > +++ b/drivers/net/xen-netback/hash.c
> > @@ -345,7 +345,7 @@ u32 xenvif_set_hash_mapping(struct xenvif *vif, u32 gref, u32 len,
> >  		.flags = GNTCOPY_source_gref
> >  	}};
> >  
> > -	if ((off + len < off) || (off + len > vif->hash.size) ||
> > +	if ((add_would_overflow(off, len)) || (off + len > vif->hash.size) ||
> 
> I'm not maintainer of this code, but if I was I would ask that the
> excess parentheses be removed, to improve readability.

Good call. I will adjust that. Thanks!

-Kees

-- 
Kees Cook