Commit 35cf2845 authored by Lance Richardson's avatar Lance Richardson Committed by David S. Miller

vxlan: eliminate cached dst leak

After commit 0c1d70af ("net: use dst_cache for vxlan device"),
cached dst entries could be leaked when more than one remote was
present for a given vxlan_fdb entry, causing subsequent netns
operations to block indefinitely and "unregister_netdevice: waiting
for lo to become free." messages to appear in the kernel log.

Fix by properly releasing cached dst and freeing resources in this

Fixes: 0c1d70af ("net: use dst_cache for vxlan device")
Signed-off-by: default avatarLance Richardson <>
Acked-by: default avatarPaolo Abeni <>
Signed-off-by: default avatarDavid S. Miller <>
parent aeb07324
......@@ -740,6 +740,22 @@ static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
call_rcu(&f->rcu, vxlan_fdb_free);
static void vxlan_dst_free(struct rcu_head *head)
struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
struct vxlan_rdst *rd)
vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
call_rcu(&rd->rcu, vxlan_dst_free);
static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
__be32 *vni, u32 *ifindex)
......@@ -864,9 +880,7 @@ static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
* otherwise destroy the fdb entry
if (rd && !list_is_singular(&f->remotes)) {
vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
kfree_rcu(rd, rcu);
vxlan_fdb_dst_destroy(vxlan, f, rd);
goto out;
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