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authorJens Rosenboom <me@jayr.de>2009-06-25 08:55:50 +0400
committerDavid S. Miller <davem@davemloft.net>2009-06-26 07:03:50 +0400
commita1faa69810b2af562b70b2a71c116c7d03575dd3 (patch)
tree074a4b79742f1749eafc5e539f3241e5d57d8236 /net
parent1ac530b3553e0b4dc1e18a32bed57cfa84cd57cb (diff)
downloadlinux-a1faa69810b2af562b70b2a71c116c7d03575dd3.tar.xz
ipv6: avoid wraparound for expired preferred lifetime
Avoid showing wrong high values when the preferred lifetime of an address is expired. Signed-off-by: Jens Rosenboom <me@jayr.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/addrconf.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 8c1e86afbbf5..3883b4036a74 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3362,7 +3362,10 @@ static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
valid = ifa->valid_lft;
if (preferred != INFINITY_LIFE_TIME) {
long tval = (jiffies - ifa->tstamp)/HZ;
- preferred -= tval;
+ if (preferred > tval)
+ preferred -= tval;
+ else
+ preferred = 0;
if (valid != INFINITY_LIFE_TIME)
valid -= tval;
}