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8021q: delete cleared egress QoS mappings

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vlan_dev_set_egress_priority() currently keeps cleared egress
priority mappings in the hash as tombstones. Repeated set/clear cycles
with distinct skb priorities therefore accumulate mapping nodes until
device teardown and leak memory.

Delete mappings when vlan_prio is cleared instead of keeping tombstones.
Now that the egress mapping lists are RCU protected, the node can be
unlinked safely and freed after a grace period.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable@kernel.org
Reported-by: Yifan Wu <yifanwucs@gmail.com>
Reported-by: Juefei Pu <tomapufckgml@gmail.com>
Reported-by: Xin Liu <bird@lzu.edu.cn>
Co-developed-by: Yuan Tan <yuantan098@gmail.com>
Signed-off-by: Yuan Tan <yuantan098@gmail.com>
Signed-off-by: Longxuan Yu <ylong030@ucr.edu>
Signed-off-by: Ren Wei <n05ec@lzu.edu.cn>
Link: https://patch.msgid.link/ecfa6f6ce2467a42647ff4c5221238ae85b79a59.1776647968.git.yuantan098@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Longxuan Yu 2026-04-20 11:18:46 +08:00 committed by Paolo Abeni
parent fc69decc81
commit 7dddc74af3
2 changed files with 14 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
net/8021q/vlan_dev.c
View File

@ -172,26 +172,34 @@ int vlan_dev_set_egress_priority(const struct net_device *dev,
u32 skb_prio, u16 vlan_prio)
{
struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
struct vlan_priority_tci_mapping __rcu **mpp;
struct vlan_priority_tci_mapping *mp;
struct vlan_priority_tci_mapping *np;
u32 bucket = skb_prio & 0xF;
u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
/* See if a priority mapping exists.. */
mp = rtnl_dereference(vlan->egress_priority_map[bucket]);
mpp = &vlan->egress_priority_map[bucket];
mp = rtnl_dereference(*mpp);
while (mp) {
if (mp->priority == skb_prio) {
if (mp->vlan_qos && !vlan_qos)
if (!vlan_qos) {
rcu_assign_pointer(*mpp, rtnl_dereference(mp->next));
vlan->nr_egress_mappings--;
else if (!mp->vlan_qos && vlan_qos)
vlan->nr_egress_mappings++;
WRITE_ONCE(mp->vlan_qos, vlan_qos);
kfree_rcu(mp, rcu);
} else {
WRITE_ONCE(mp->vlan_qos, vlan_qos);
}
return 0;
}
mp = rtnl_dereference(mp->next);
mpp = &mp->next;
mp = rtnl_dereference(*mpp);
}
/* Create a new mapping then. */
if (!vlan_qos)
return 0;
np = kmalloc_obj(struct vlan_priority_tci_mapping);
if (!np)
return -ENOBUFS;

4
net/8021q/vlan_netlink.c
View File

@ -263,10 +263,6 @@ static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
for (pm = rcu_dereference_rtnl(vlan->egress_priority_map[i]); pm;
pm = rcu_dereference_rtnl(pm->next)) {
u16 vlan_qos = READ_ONCE(pm->vlan_qos);
if (!vlan_qos)
continue;
m.from = pm->priority;
m.to = (vlan_qos >> 13) & 0x7;
if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,