netdev - Re: [PATCH net-next 2/9] bnxt_en: Add Support for ETHTOOL_GMODULEINFO and ETHTOOL

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Date:	Sun, 15 May 2016 02:31:57 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Michael Chan <michael.chan@...adcom.com>, davem@...emloft.net
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next 2/9] bnxt_en: Add Support for
 ETHTOOL_GMODULEINFO and ETHTOOL_GMODULEEEPRO

On Sat, 2016-05-14 at 20:29 -0400, Michael Chan wrote:
> From: Ajit Khaparde <ajit.khaparde@...adcom.com>
[...]
> +	/* Read A2 portion of the EEPROM */
> +	if (length) {
> +		start -= ETH_MODULE_SFF_8436_LEN;
> +		bnxt_read_sfp_module_eeprom_info(bp, I2C_DEV_ADDR_A2, 1, start,
> +						 length, data + start);

The output address calculation (data + start) makes no sense at all.
If eeprom->offset < ETH_MODULE_SFF_8436_LEN then start == 0 here and
this read overwrites earlier data in the output buffer.  If
eeeprom->offset > ETH_MODULE_SFF_8436_LEN then start > 0 here and this
overruns the output buffer.

I think that 'data' should be incremented along with 'start' in the
previous if-block.

Ben.

> +	}
> +	return rc;
> +}
[...]

-- 
Ben Hutchings
For every action, there is an equal and opposite criticism. - Harrison

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