netdev - [PATCH v2 net 2/3] lan78xx: Allow EEPROM write for less than MAX_EEPROM

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Date:   Mon, 11 Sep 2017 18:52:21 +0000
From:   <Nisar.Sayed@...rochip.com>
To:     <davem@...emloft.net>
CC:     <UNGLinuxDriver@...rochip.com>, <netdev@...r.kernel.org>
Subject: [PATCH v2 net 2/3] lan78xx: Allow EEPROM write for less than
 MAX_EEPROM_SIZE

From: Nisar Sayed <Nisar.Sayed@...rochip.com>

Allow EEPROM write for less than MAX_EEPROM_SIZE

Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Signed-off-by: Nisar Sayed <Nisar.Sayed@...rochip.com>
---
 drivers/net/usb/lan78xx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index baf91c7..02d64f75 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -1290,8 +1290,8 @@ static int lan78xx_ethtool_set_eeprom(struct net_device *netdev,
 
 	/* Allow entire eeprom update only */
 	if ((ee->magic == LAN78XX_EEPROM_MAGIC) &&
-	    (ee->offset == 0) &&
-	    (ee->len == 512) &&
+	    (ee->offset >= 0 && ee->offset < MAX_EEPROM_SIZE) &&
+	    (ee->len > 0 && (ee->offset + ee->len) <= MAX_EEPROM_SIZE) &&
 	    (data[0] == EEPROM_INDICATOR))
 		ret = lan78xx_write_raw_eeprom(dev, ee->offset, ee->len, data);
 	else if ((ee->magic == LAN78XX_OTP_MAGIC) &&
-- 
1.9.1