netdev - Re: [PATCH v2] net: dsa: mv88e6xxx: hwtstamp: fix potential negative array index read

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Message-ID: <20180215211251.GC3080@lunn.ch>
Date:   Thu, 15 Feb 2018 22:12:51 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Cc:     Brandon Streiff <brandon.streiff@...com>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: dsa: mv88e6xxx: hwtstamp: fix potential negative
 array index read

On Thu, Feb 15, 2018 at 12:31:39PM -0600, Gustavo A. R. Silva wrote:
> _port_ is being used as index to array port_hwtstamp before verifying
> it is a non-negative number and a valid index at line 209 and 258:
> 
> if (port < 0 || port >= mv88e6xxx_num_ports(chip))
> 
> Fix this by checking _port_ before using it as index to array
> port_hwtstamp.
> 
> Addresses-Coverity-ID: 1465287 ("Negative array index read")
> Addresses-Coverity-ID: 1465291 ("Negative array index read")
> Fixes: c6fe0ad2c349 ("net: dsa: mv88e6xxx: add rx/tx timestamping support")
> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew