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hsr: implement dellink to clean up resources 

hsr_link_ops implements ->newlink() but not ->dellink(),
which leads that resources not released after removing the device,
particularly the entries in self_node_db and node_db.

So add ->dellink() implementation to replace the priv_destructor.
This also makes the code slightly easier to understand.

Reported-by: syzbot+c6167ec3de7def23d1e8@syzkaller.appspotmail.com
Cc: Arvid Brodin <arvid.brodin@alten.se>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2019-07-03 17:21:13 -07:00 committed by David S. Miller
parent 619afef01f
commit b9a1e62740
5 changed files with 25 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
net/hsr/hsr_device.c
View File

@ -344,10 +344,7 @@ static void hsr_announce(struct timer_list *t)
rcu_read_unlock();
}
/* According to comments in the declaration of struct net_device, this function
* is "Called from unregister, can be used to call free_netdev". Ok then...
*/
static void hsr_dev_destroy(struct net_device *hsr_dev)
void hsr_dev_destroy(struct net_device *hsr_dev)
{
struct hsr_priv *hsr;
struct hsr_port *port;
@ -357,15 +354,16 @@ static void hsr_dev_destroy(struct net_device *hsr_dev)
hsr_debugfs_term(hsr);
rtnl_lock();
list_for_each_entry_safe(port, tmp, &hsr->ports, port_list)
hsr_del_port(port);
rtnl_unlock();
del_timer_sync(&hsr->prune_timer);
del_timer_sync(&hsr->announce_timer);
synchronize_rcu();
hsr_del_self_node(&hsr->self_node_db);
hsr_del_nodes(&hsr->node_db);
}
static const struct net_device_ops hsr_device_ops = {
@ -392,7 +390,6 @@ void hsr_dev_setup(struct net_device *dev)
dev->priv_flags |= IFF_NO_QUEUE;
dev->needs_free_netdev = true;
dev->priv_destructor = hsr_dev_destroy;
dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
@ -497,7 +494,7 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
list_for_each_entry_safe(port, tmp, &hsr->ports, port_list)
hsr_del_port(port);
err_add_port:
hsr_del_node(&hsr->self_node_db);
hsr_del_self_node(&hsr->self_node_db);
return res;
}

1
net/hsr/hsr_device.h
View File

@ -14,6 +14,7 @@
void hsr_dev_setup(struct net_device *dev);
int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
unsigned char multicast_spec, u8 protocol_version);
void hsr_dev_destroy(struct net_device *hsr_dev);
void hsr_check_carrier_and_operstate(struct hsr_priv *hsr);
bool is_hsr_master(struct net_device *dev);
int hsr_get_max_mtu(struct hsr_priv *hsr);

11
net/hsr/hsr_framereg.c
View File

@ -104,7 +104,7 @@ int hsr_create_self_node(struct list_head *self_node_db,
return 0;
}
void hsr_del_node(struct list_head *self_node_db)
void hsr_del_self_node(struct list_head *self_node_db)
{
struct hsr_node *node;
@ -117,6 +117,15 @@ void hsr_del_node(struct list_head *self_node_db)
}
}
void hsr_del_nodes(struct list_head *node_db)
{
struct hsr_node *node;
struct hsr_node *tmp;
list_for_each_entry_safe(node, tmp, node_db, mac_list)
kfree(node);
}
/* Allocate an hsr_node and add it to node_db. 'addr' is the node's address_A;
* seq_out is used to initialize filtering of outgoing duplicate frames
* originating from the newly added node.

3
net/hsr/hsr_framereg.h
View File

@ -12,7 +12,8 @@
struct hsr_node;
void hsr_del_node(struct list_head *self_node_db);
void hsr_del_self_node(struct list_head *self_node_db);
void hsr_del_nodes(struct list_head *node_db);
struct hsr_node *hsr_add_node(struct list_head *node_db, unsigned char addr[],
u16 seq_out);
struct hsr_node *hsr_get_node(struct hsr_port *port, struct sk_buff *skb,

7
net/hsr/hsr_netlink.c
View File

@ -69,6 +69,12 @@ static int hsr_newlink(struct net *src_net, struct net_device *dev,
return hsr_dev_finalize(dev, link, multicast_spec, hsr_version);
}
static void hsr_dellink(struct net_device *hsr_dev, struct list_head *head)
{
hsr_dev_destroy(hsr_dev);
unregister_netdevice_queue(hsr_dev, head);
}
static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
struct hsr_priv *hsr;
@ -113,6 +119,7 @@ static struct rtnl_link_ops hsr_link_ops __read_mostly = {
.priv_size = sizeof(struct hsr_priv),
.setup = hsr_dev_setup,
.newlink = hsr_newlink,
.dellink = hsr_dellink,
.fill_info = hsr_fill_info,
};