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. Actually, in this case, the client obtains the default route through DHCPv6 instead of RA messages. So if orig_inf == NULL and route_inf == null, we should not set 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 _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
