From 17216748c827290d32336c6ed0af71bcf0849672 Mon Sep 17 00:00:00 2001 From: Qiumiao Zhang Date: Thu, 17 Feb 2022 07:27:58 -0500 Subject: [PATCH] net: fix null pointer dereference when parsing ICMP6_ROUTER_ADVERTISE messages During UEFI PXE boot in IPv6 network, if the DHCP server adopts stateful automatic configuration, then the client receives a ICMP6_ROUTER_ADVERTISE multicast message from the server. This may be received without the interfaced having a configured network address, so orig_inf will be null, which can lead to a null dereference when creating the default route. Fixes bug: https://savannah.gnu.org/bugs/index.php?62072 --- grub-core/net/icmp6.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/grub-core/net/icmp6.c b/grub-core/net/icmp6.c index 2cbd95d..264fc4a 100644 --- a/grub-core/net/icmp6.c +++ b/grub-core/net/icmp6.c @@ -477,7 +477,7 @@ grub_net_recv_icmp6_packet (struct grub_net_buff *nb, /* May not have gotten slaac info, find a global address on this card. */ - if (route_inf == NULL) + if (route_inf == NULL && orig_inf != NULL) { FOR_NET_NETWORK_LEVEL_INTERFACES (inf) { -- 2.19.1