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geneve: fix hlist corruption

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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: 8ed66f0e82 ("geneve: implement support for IPv6-based tunnels")
Cc: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Benc 2017-07-02 19:00:58 +02:00 committed by David S. Miller
parent 69e766612c
commit 4b4c21fad6
1 changed files with 32 additions and 16 deletions
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48
drivers/net/geneve.c
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@ -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;
}