From: Hans Dedecker <dedeckeh@gmail.com>
Date: Sun, 18 Jul 2021 16:43:26 +0000 (+0200)
Subject: dhcpv6-ia: fix invalid preferred lifetime
X-Git-Url: http://git.openwrt.org/?a=commitdiff_plain;h=bc9d317f2921ae6b529f2c9f8de79b75992e206f;p=project%2Fodhcpd.git

dhcpv6-ia: fix invalid preferred lifetime

Preferred lifetime cannot be greater than the valid lifetime of an IA;
fix this by checking if the preferred lifetime does not exceed the
valid lifetime of an IA

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
---

diff --git a/src/dhcpv6-ia.c b/src/dhcpv6-ia.c
index 639e368..c378c09 100644
--- a/src/dhcpv6-ia.c
+++ b/src/dhcpv6-ia.c
@@ -896,6 +896,9 @@ static size_t build_ia(uint8_t *buf, size_t buflen, uint16_t status,
 			if (prefix_valid > leasetime)
 				prefix_valid = leasetime;
 
+			if (prefix_pref > prefix_valid)
+				prefix_pref = prefix_valid;
+
 			if (a->flags & OAF_DHCPV6_PD) {
 				struct dhcpv6_ia_prefix o_ia_p = {
 					.type = htons(DHCPV6_OPT_IA_PREFIX),