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ipv6: Clamp reported valid_lft to a minimum of 0

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Since addresses are only revalidated every 2 minutes, the reported
valid_lft can underflow shortly before the address is deleted.
Clamp it to a minimum of 0, as for prefered_lft.

Reported-by: Piotr Lewandowski <piotr.lewandowski@gmail.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2010-06-26 11:37:47 +00:00 committed by David S. Miller
parent 5a9dbfe08e
commit f56619fc72
1 changed files with 6 additions and 2 deletions
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8
net/ipv6/addrconf.c
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@ -3495,8 +3495,12 @@ static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
preferred -= tval;
else
preferred = 0;
if (valid != INFINITY_LIFE_TIME)
valid -= tval;
if (valid != INFINITY_LIFE_TIME) {
if (valid > tval)
valid -= tval;
else
valid = 0;
}
}
} else {
preferred = INFINITY_LIFE_TIME;