netdev - Re: [PATCH net-next v1] vlan: skip nested type that is not IFLA_VLAN_QOS

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Date: Thu, 18 Jan 2024 20:57:05 +0800 (GMT+08:00)
From: "Lin Ma" <linma@....edu.cn>
To: "Paolo Abeni" <pabeni@...hat.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v1] vlan: skip nested type that is not
 IFLA_VLAN_QOS_MAPPING

Hello Paolo,

> 
> On Wed, 2024-01-17 at 23:38 +0800, Lin Ma wrote:
> > In the vlan_changelink function, a loop is used to parse the nested
> > attributes IFLA_VLAN_EGRESS_QOS and IFLA_VLAN_INGRESS_QOS in order to
> > obtain the struct ifla_vlan_qos_mapping. These two nested attributes are
> > checked in the vlan_validate_qos_map function, which calls
> > nla_validate_nested_deprecated with the vlan_map_policy.
> > 
> > However, this deprecated validator applies a LIBERAL strictness, allowing
> > the presence of an attribute with the type IFLA_VLAN_QOS_UNSPEC.
> > Consequently, the loop in vlan_changelink may parse an attribute of type
> > IFLA_VLAN_QOS_UNSPEC and believe it carries a payload of
> > struct ifla_vlan_qos_mapping, which is not necessarily true.
> > 
> > To address this issue and ensure compatibility, this patch introduces two
> > type checks that skip attributes whose type is not IFLA_VLAN_QOS_MAPPING.
> > 
> > Signed-off-by: Lin Ma <linma@....edu.cn>
> 
> Why are you targeting net-next? this looks like a fix suitable for
> 'net' - with a proper fixes tag.
> 

Thanks for your suggestions, sometimes I just mistakenly do the opposite of what I intended to. 

I will send version two with the right tag.

> Cheers,
> 
> Paolo

Thanks
Lin