netdev - [PATCH 1 of 5] IPv6: do not wrap around when the lifetime has expired

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Date:	Sun, 23 Mar 2008 21:46:09 +0100
From:	Benoit Boissinot <benoit.boissinot@...-lyon.org>
To:	netdev@...r.kernel.org
Cc:	pekkas@...core.fi, yoshfuji@...ux-ipv6.org
Subject: [PATCH 1 of 5] IPv6: do not wrap around when the lifetime has expired

IPv6: do not wrap around when the lifetime has expired

Instead of reporting overly large lifetimes to userspace,
report a lifetime of 0 when a lifetime has expired.

Signed-off-by: Benoit Boissinot <benoit.boissinot@...-lyon.org>

diff -r c6c17f6335a1 -r dd125a7f8696 net/ipv6/addrconf.c
--- a/net/ipv6/addrconf.c	Sat Mar 22 14:33:51 2008 +0100
+++ b/net/ipv6/addrconf.c	Sat Mar 22 00:50:21 2008 +0100
@@ -3230,10 +3230,17 @@
 		preferred = ifa->prefered_lft;
 		valid = ifa->valid_lft;
 		if (preferred != INFINITY_LIFE_TIME) {
-			long tval = (jiffies - ifa->tstamp)/HZ;
-			preferred -= tval;
-			if (valid != INFINITY_LIFE_TIME)
-				valid -= tval;
+			unsigned long tval = (jiffies - ifa->tstamp)/HZ;
+			if (tval > preferred)
+				preferred = 0;
+			else
+				preferred -= tval;
+			if (valid != INFINITY_LIFE_TIME) {
+				if (tval > valid)
+					valid = 0;
+				else
+					valid -= tval;
+			}
 		}
 	} else {
 		preferred = INFINITY_LIFE_TIME;
--
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