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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
automatic
configuration, when the client receives the ICMP6_ROUTER_ADVERTISE message
multicast
from the server, it will cause the problem of dereference null pointer and cause
the grub2 program to crash.
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
- [PATCH] net: fix null pointer dereference when parsing ICMP6_ROUTER_ADVERTISE messages,
Qiumiao Zhang <=