The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 4b4c21fad6ae6bd58ff1566f23b0f4f70fdc9a30 Mon Sep 17 00:00:00 2001
From: Jiri Benc <jbenc@xxxxxxxxxx>
Date: Sun, 2 Jul 2017 19:00:58 +0200
Subject: [PATCH] geneve: fix hlist corruption
It's not a good idea to add the same hlist_node to two different hash lists.
This leads to various hard to debug memory corruptions.
Fixes: 8ed66f0e8235 ("geneve: implement support for IPv6-based tunnels")
Cc: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Jiri Benc <jbenc@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index eb77201cb718..de8156c6b292 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -45,9 +45,17 @@ struct geneve_net {
static unsigned int geneve_net_id;
+struct geneve_dev_node {
+ struct hlist_node hlist;
+ struct geneve_dev *geneve;
+};
+
/* Pseudo network device */
struct geneve_dev {
- struct hlist_node hlist; /* vni hash table */
+ struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
+#if IS_ENABLED(CONFIG_IPV6)
+ struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
+#endif
struct net *net; /* netns for packet i/o */
struct net_device *dev; /* netdev for geneve tunnel */
struct ip_tunnel_info info;
@@ -123,16 +131,16 @@ static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
__be32 addr, u8 vni[])
{
struct hlist_head *vni_list_head;
- struct geneve_dev *geneve;
+ struct geneve_dev_node *node;
__u32 hash;
/* Find the device for this VNI */
hash = geneve_net_vni_hash(vni);
vni_list_head = &gs->vni_list[hash];
- hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
- if (eq_tun_id_and_vni((u8 *)&geneve->info.key.tun_id, vni) &&
- addr == geneve->info.key.u.ipv4.dst)
- return geneve;
+ hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
+ if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
+ addr == node->geneve->info.key.u.ipv4.dst)
+ return node->geneve;
}
return NULL;
}
@@ -142,16 +150,16 @@ static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
struct in6_addr addr6, u8 vni[])
{
struct hlist_head *vni_list_head;
- struct geneve_dev *geneve;
+ struct geneve_dev_node *node;
__u32 hash;
/* Find the device for this VNI */
hash = geneve_net_vni_hash(vni);
vni_list_head = &gs->vni_list[hash];
- hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
- if (eq_tun_id_and_vni((u8 *)&geneve->info.key.tun_id, vni) &&
- ipv6_addr_equal(&addr6, &geneve->info.key.u.ipv6.dst))
- return geneve;
+ hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
+ if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
+ ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
+ return node->geneve;
}
return NULL;
}
@@ -591,6 +599,7 @@ static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
{
struct net *net = geneve->net;
struct geneve_net *gn = net_generic(net, geneve_net_id);
+ struct geneve_dev_node *node;
struct geneve_sock *gs;
__u8 vni[3];
__u32 hash;
@@ -609,15 +618,20 @@ static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
out:
gs->collect_md = geneve->collect_md;
#if IS_ENABLED(CONFIG_IPV6)
- if (ipv6)
+ if (ipv6) {
rcu_assign_pointer(geneve->sock6, gs);
- else
+ node = &geneve->hlist6;
+ } else
#endif
+ {
rcu_assign_pointer(geneve->sock4, gs);
+ node = &geneve->hlist4;
+ }
+ node->geneve = geneve;
tunnel_id_to_vni(geneve->info.key.tun_id, vni);
hash = geneve_net_vni_hash(vni);
- hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
+ hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
return 0;
}
@@ -644,8 +658,10 @@ static int geneve_stop(struct net_device *dev)
{
struct geneve_dev *geneve = netdev_priv(dev);
- if (!hlist_unhashed(&geneve->hlist))
- hlist_del_rcu(&geneve->hlist);
+ hlist_del_init_rcu(&geneve->hlist4.hlist);
+#if IS_ENABLED(CONFIG_IPV6)
+ hlist_del_init_rcu(&geneve->hlist6.hlist);
+#endif
geneve_sock_release(geneve);
return 0;
}