From: David Härdeman <david@hardeman.nu>
Date: Mon, 1 Dec 2025 07:37:32 +0000 (+0100)
Subject: dhcpv6-ia: fix crash in dhcpv6_free_lease()
X-Git-Url: http://git.openwrt.org/%22https:/collectd.org///%22https:/collectd.org/?a=commitdiff_plain;h=94ef124f726e216648670c6319fd227fdb2691dd;p=project%2Fodhcpd.git

dhcpv6-ia: fix crash in dhcpv6_free_lease()

Note that dhcpv6_free_lease() can be called with a NULL argument e.g.
from dhcpv6_ia_handle_IAs() when iface->no_dynamic_dhcp is set and a
client without a static lease cfg tries to get a dynamic lease.

Closes: #321

Signed-off-by: David Härdeman <david@hardeman.nu>
Link: https://github.com/openwrt/odhcpd/pull/335
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---

diff --git a/src/dhcpv6-ia.c b/src/dhcpv6-ia.c
index f227ad6..5af952d 100644
--- a/src/dhcpv6-ia.c
+++ b/src/dhcpv6-ia.c
@@ -60,6 +60,9 @@ dhcpv6_alloc_lease(size_t extra_len)
 
 void dhcpv6_free_lease(struct dhcpv6_lease *a)
 {
+	if (!a)
+		return;
+
 	list_del(&a->head);
 	list_del(&a->lease_cfg_list);