From: Lin Ma <linma@zju.edu.cn>
To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com, linma@zju.edu.cn, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH net-next v1] vlan: skip nested type that is not IFLA_VLAN_QOS_MAPPING
Date: Wed, 17 Jan 2024 23:38:10 +0800 [thread overview]
Message-ID: <20240117153810.1197794-1-linma@zju.edu.cn> (raw)
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@zju.edu.cn>
---
net/8021q/vlan_netlink.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c
index 214532173536..a3b68243fd4b 100644
--- a/net/8021q/vlan_netlink.c
+++ b/net/8021q/vlan_netlink.c
@@ -118,12 +118,16 @@ static int vlan_changelink(struct net_device *dev, struct nlattr *tb[],
}
if (data[IFLA_VLAN_INGRESS_QOS]) {
nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
+ if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING)
+ continue;
m = nla_data(attr);
vlan_dev_set_ingress_priority(dev, m->to, m->from);
}
}
if (data[IFLA_VLAN_EGRESS_QOS]) {
nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
+ if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING)
+ continue;
m = nla_data(attr);
err = vlan_dev_set_egress_priority(dev, m->from, m->to);
if (err)
--
2.17.1
next reply other threads:[~2024-01-17 15:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-17 15:38 Lin Ma [this message]
2024-01-18 12:19 ` [PATCH net-next v1] vlan: skip nested type that is not IFLA_VLAN_QOS_MAPPING Paolo Abeni
2024-01-18 12:57 ` Lin Ma
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