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Re: [PATCH v2] net: fix null pointer dereference when parsing ICMP6_ROUT

From: Daniel Kiper
Subject: Re: [PATCH v2] net: fix null pointer dereference when parsing ICMP6_ROUTER_ADVERTISE messages
Date: Thu, 21 Apr 2022 15:40:47 +0200
User-agent: NeoMutt/20170113 (1.7.2)

On Sat, Apr 16, 2022 at 09:50:11AM +0800, Qiumiao Zhang via Grub-devel wrote:
> 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:

Missing "Signed-off-by: Qiumiao Zhang <>" line.
May I add it on behalf of you?

Otherwise Reviewed-by: Daniel Kiper <>


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