linux-kernel - Re: [PATCH] [v2] xen: hypercall: fix out-of-bounds memcpy

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Date:   Mon, 5 Feb 2018 10:51:10 -0500 (EST)
From:   Nicolas Pitre <nico@...xnic.net>
To:     Arnd Bergmann <arnd@...db.de>
cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        David Laight <David.Laight@...lab.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] xen: hypercall: fix out-of-bounds memcpy

On Mon, 5 Feb 2018, Arnd Bergmann wrote:

> +	if (cmd > ARRAY_SIZE(evtchnop_len))
> +		return -ENOSYS;
> +	len = evtchnop_len[cmd];

What if cmd == ARRAY_SIZE(evtchnop_len) ?


Nicolas