netdev - [PATCH net-2.6 1/4] [IPV6] ADDRCONF: Fix route lifetime setting in corner case.

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Message-Id: <20080515.181755.63646417.yoshfuji@linux-ipv6.org>
Date:	Thu, 15 May 2008 18:17:55 +0900 (JST)
From:	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
To:	davem@...emloft.net
Cc:	yoshfuji@...ux-ipv6.org, netdev@...r.kernel.org
Subject: [PATCH net-2.6 1/4] [IPV6] ADDRCONF: Fix route lifetime setting in
 corner case.

Because of arithmetic overflow avoidance, the actual lifetime setting
(vs the value given by RA) did not increase monotonically around
0x7fffffff/HZ.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
---
 net/ipv6/route.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 12bba08..98aa50c 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -475,7 +475,7 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
 	lifetime = ntohl(rinfo->lifetime);
 	if (lifetime == 0xffffffff) {
 		/* infinity */
-	} else if (lifetime > 0x7fffffff/HZ) {
+	} else if (lifetime > 0x7fffffff/HZ - 1) {
 		/* Avoid arithmetic overflow */
 		lifetime = 0x7fffffff/HZ - 1;
 	}
-- 
1.4.4.4

-- 
YOSHIFUJI Hideaki @ USAGI Project  <yoshfuji@...ux-ipv6.org>
GPG-FP  : 9022 65EB 1ECF 3AD1 0BDF  80D8 4807 F894 E062 0EEA
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