From: Paul Donald <newtwen+github@gmail.com>
Date: Thu, 13 Nov 2025 00:13:51 +0000 (+0100)
Subject: dhcpv6: DHCPV6_OPT_INFO_REFRESH contains a 4 byte option
X-Git-Url: http://git.openwrt.org/%22https:/collectd.org//%22http:/www.crowdsec.net/%22/%22https:/collectd.org/%22http:/www.crowdsec.net/%22?a=commitdiff_plain;h=e0a9d02b52d13d4ac1ffb725ad66aa61fb41fca0;p=project%2Fodhcp6c.git

dhcpv6: DHCPV6_OPT_INFO_REFRESH contains a 4 byte option

we shall not expect data beyond 4 bytes. So the logic should be ==

Signed-off-by: Paul Donald <newtwen+github@gmail.com>
Link: https://github.com/openwrt/odhcp6c/pull/118
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---

diff --git a/src/dhcpv6.c b/src/dhcpv6.c
index e5ef5cc..7bcaee0 100644
--- a/src/dhcpv6.c
+++ b/src/dhcpv6.c
@@ -1475,7 +1475,7 @@ static int dhcpv6_handle_reply(enum dhcpv6_msg orig, _o_unused const int rc,
 				break;
 
 			case DHCPV6_OPT_INFO_REFRESH:
-				if (olen >= 4)
+				if (olen == 4)
 					refresh = ntohl_unaligned(odata);
 				break;