From: dongshengyuan <545258830@qq.com>
Date: Thu, 25 Jun 2026 08:19:14 +0000 (+0800)
Subject: network: roll back ipv6ll_address on link_ipv6ll_gained() failure
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F42745%2Fhead;p=thirdparty%2Fsystemd.git

network: roll back ipv6ll_address on link_ipv6ll_gained() failure

If link_ipv6ll_gained() fails after ipv6ll_address is set, the address
remains non-null and the null-guard in address_update() never triggers
again, permanently suppressing SLAAC, DHCPv6 and RA on that link.

Clear ipv6ll_address on the failure path so the guard can fire when
the address is re-announced.

Signed-off-by: dongshengyuan <dongshengyuan@uniontech.com>
---

diff --git a/src/network/networkd-address.c b/src/network/networkd-address.c
index 11337126e58..582069cf397 100644
--- a/src/network/networkd-address.c
+++ b/src/network/networkd-address.c
@@ -811,8 +811,10 @@ static int address_update(Address *address) {
                 link->ipv6ll_address = address->in_addr.in6;
 
                 r = link_ipv6ll_gained(link);
-                if (r < 0)
+                if (r < 0) {
+                        link->ipv6ll_address = (const struct in6_addr) {};
                         return r;
+                }
         }
 
         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))