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Re: Re: [PATCH v2] net: fix null pointer dereference when parsing ICMP6_

From: zhangqiumiao
Subject: Re: Re: [PATCH v2] net: fix null pointer dereference when parsing ICMP6_ROUTER_ADVERTISE messages
Date: Thu, 21 Apr 2022 13:56:35 +0000

On Thu, Apr 21, 2022 at 21:41:52PM +0800, Daniel Kiper wrote:
> 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?

Yes, that's perfect.

> Otherwise Reviewed-by: Daniel Kiper <>


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