linux-kernel - [PATCH] hysdn: Fix writing outside the field on 64 bits

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Message-Id: <1227636313.21706.2.camel@plop>
Date:	Tue, 25 Nov 2008 19:05:13 +0100
From:	Pascal Terjan <pterjan@...driva.com>
To:	kkeil@...e.de
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] hysdn: Fix writing outside the field on 64 bits

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 â€˜net_openâ€™:
drivers/isdn/hysdn/hysdn_net.c:91: warning: array subscript is below array bounds

Signed-off-by: Pascal Terjan <pterjan@...driva.com>
---
 drivers/isdn/hysdn/hysdn_net.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/isdn/hysdn/hysdn_net.c b/drivers/isdn/hysdn/hysdn_net.c
index cfa8fa5..7358712 100644
--- a/drivers/isdn/hysdn/hysdn_net.c
+++ b/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);
-- 
1.6.0.4

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