--- a/net/ipv6/addrconf.c	2022-02-08 08:17:30.000000000 +0300
+++ b/net/ipv6/addrconf.c	2024-08-06 00:58:50.314960285 +0300
@@ -2125,6 +2125,9 @@
 	 * - If < 0, put routes into table dev->ifindex + (-rt_table).
 	 */
 	struct inet6_dev *idev = in6_dev_get(dev);
+	if (!idev) {
+		return 0;
+	}
 	u32 table;
 	int sysctl = idev->cnf.accept_ra_rt_table;
 	if (sysctl == 0) {