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 13:19:39 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Lin Ma <linma@....edu.cn>, 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

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.

Cheers,

Paolo