netdev - [patch 5/5] hysdn: fix writing outside the field on 64 bits

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Message-Id: <200812012224.mB1MOPxA014993@imap1.linux-foundation.org>
Date:	Mon, 01 Dec 2008 14:24:25 -0800
From:	akpm@...ux-foundation.org
To:	kkeil@...e.de
Cc:	netdev@...r.kernel.org, akpm@...ux-foundation.org,
	pterjan@...driva.com
Subject: [patch 5/5] hysdn: fix writing outside the field on 64 bits

From: Pascal Terjan <pterjan@...driva.com>

ifa_local is assumed to be unsigned long which lead to writing the address
at dev->dev_addr-2 instead of +2

noticed thanks to gcc:

drivers/isdn/hysdn/hysdn_net.c: In function `net_open':
drivers/isdn/hysdn/hysdn_net.c:91: warning: array subscript is below array bounds

Signed-off-by: Pascal Terjan <pterjan@...driva.com>
Cc: Karsten Keil <kkeil@...e.de>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 drivers/isdn/hysdn/hysdn_net.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff -puN drivers/isdn/hysdn/hysdn_net.c~hysdn-fix-writing-outside-the-field-on-64-bits drivers/isdn/hysdn/hysdn_net.c
--- a/drivers/isdn/hysdn/hysdn_net.c~hysdn-fix-writing-outside-the-field-on-64-bits
+++ a/drivers/isdn/hysdn/hysdn_net.c
@@ -83,12 +83,12 @@ net_open(struct net_device *dev)
 
 	/* Fill in the MAC-level header (if not already set) */
 	if (!card->mac_addr[0]) {
-		for (i = 0; i < ETH_ALEN - sizeof(unsigned long); i++)
+		for (i = 0; i < ETH_ALEN; i++)
 			dev->dev_addr[i] = 0xfc;
 		if ((in_dev = dev->ip_ptr) != NULL) {
 			struct in_ifaddr *ifa = in_dev->ifa_list;
 			if (ifa != NULL)
-				memcpy(dev->dev_addr + (ETH_ALEN - sizeof(unsigned long)), &ifa->ifa_local, sizeof(unsigned long));
+				memcpy(dev->dev_addr + (ETH_ALEN - sizeof(ifa->ifa_local)), &ifa->ifa_local, sizeof(ifa->ifa_local));
 		}
 	} else
 		memcpy(dev->dev_addr, card->mac_addr, ETH_ALEN);
_
--
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