netdev - [PATCH v2 2/5] net: ipv6/addrconf: clamp preferred

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Date: Mon, 28 Aug 2023 23:44:44 -0600
From: Alex Henrie <alexhenrie24@...il.com>
To: netdev@...r.kernel.org,
	jbohac@...e.cz,
	benoit.boissinot@...-lyon.org,
	davem@...emloft.net,
	hideaki.yoshifuji@...aclelinux.com,
	dsahern@...nel.org,
	pabeni@...hat.com
Cc: Alex Henrie <alexhenrie24@...il.com>
Subject: [PATCH v2 2/5] net: ipv6/addrconf: clamp preferred_lft to the maximum allowed

Without this patch, there is nothing to stop the preferred lifetime of a
temporary address from being greater than its valid lifetime. If that
was the case, the valid lifetime was effectively ignored.

Fixes: 76506a986dc3 (IPv6: fix DESYNC_FACTOR, 2016-10-13)
Signed-off-by: Alex Henrie <alexhenrie24@...il.com>
---
 net/ipv6/addrconf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index c93a2b9a9172..561c6266040a 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1387,6 +1387,7 @@ static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
 			      idev->cnf.temp_valid_lft + age);
 	cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
 	cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
+	cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft);
 
 	cfg.plen = ifp->prefix_len;
 	tmp_tstamp = ifp->tstamp;
-- 
2.42.0