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[PATCH] net: fix null pointer dereference when parsing ICMP6_ROUTER_ADVE

From: Qiumiao Zhang
Subject: [PATCH] net: fix null pointer dereference when parsing ICMP6_ROUTER_ADVERTISE messages
Date: Thu, 17 Feb 2022 21:48:58 +0800

During UEFI PXE boot in IPv6 network, if the DHCP server adopts stateful 
configuration, when the client receives the ICMP6_ROUTER_ADVERTISE message 
from the server, it will cause the problem of dereference null pointer and cause
the grub2 program to crash.

Fixes bug:
 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)

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