netdev - Re: [PATCH v2 12/14] habanalabs/gaudi: Add ethtool support using coresight

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Message-ID: <20200914013735.GC3463198@lunn.ch>
Date:   Mon, 14 Sep 2020 03:37:35 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oded Gabbay <oded.gabbay@...il.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        SW_Drivers@...ana.ai, gregkh@...uxfoundation.org,
        davem@...emloft.net, kuba@...nel.org, f.fainelli@...il.com,
        Omer Shpigelman <oshpigelman@...ana.ai>
Subject: Re: [PATCH v2 12/14] habanalabs/gaudi: Add ethtool support using
 coresight

> +static int gaudi_nic_get_module_eeprom(struct net_device *netdev,
> +					struct ethtool_eeprom *ee, u8 *data)
> +{
> +	struct gaudi_nic_device **ptr = netdev_priv(netdev);
> +	struct gaudi_nic_device *gaudi_nic = *ptr;
> +	struct hl_device *hdev = gaudi_nic->hdev;
> +
> +	if (!ee->len)
> +		return -EINVAL;
> +
> +	memset(data, 0, ee->len);
> +	memcpy(data, hdev->asic_prop.cpucp_nic_info.qsfp_eeprom, ee->len);
> +

You memset and then memcpy the same number of bytes?

You also need to validate ee->offset, and ee->len. Otherwise this is a
vector for user space to read kernel memory after
hdev->asic_prop.cpucp_nic_info.qsfp_eeprom. See drivers/net/phy/sfp.c:
sfp_module_eeprom() as a good example of this validation.

    Andrew