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hsr: use rcu_read_lock() in hsr_get_node_{list/status}()
[ Upstream commit173756b868
] hsr_get_node_{list/status}() are not under rtnl_lock() because they are callback functions of generic netlink. But they use __dev_get_by_index() without rtnl_lock(). So, it would use unsafe data. In order to fix it, rcu_read_lock() and dev_get_by_index_rcu() are used instead of __dev_get_by_index(). Fixes:f421436a59
("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)") Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
e4723e0a85
commit
80aa1e38e1
2 changed files with 23 additions and 25 deletions
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@ -482,12 +482,9 @@ int hsr_get_node_data(struct hsr_priv *hsr,
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struct hsr_port *port;
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unsigned long tdiff;
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rcu_read_lock();
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node = find_node_by_addr_A(&hsr->node_db, addr);
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if (!node) {
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rcu_read_unlock();
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return -ENOENT; /* No such entry */
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}
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if (!node)
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return -ENOENT;
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ether_addr_copy(addr_b, node->macaddress_B);
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@ -522,7 +519,5 @@ int hsr_get_node_data(struct hsr_priv *hsr,
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*addr_b_ifindex = -1;
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}
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rcu_read_unlock();
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return 0;
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}
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@ -251,15 +251,16 @@ static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
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if (!na)
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goto invalid;
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hsr_dev = __dev_get_by_index(genl_info_net(info),
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nla_get_u32(info->attrs[HSR_A_IFINDEX]));
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rcu_read_lock();
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hsr_dev = dev_get_by_index_rcu(genl_info_net(info),
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nla_get_u32(info->attrs[HSR_A_IFINDEX]));
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if (!hsr_dev)
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goto invalid;
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goto rcu_unlock;
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if (!is_hsr_master(hsr_dev))
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goto invalid;
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goto rcu_unlock;
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/* Send reply */
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skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
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if (!skb_out) {
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res = -ENOMEM;
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goto fail;
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@ -313,12 +314,10 @@ static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
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res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq);
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if (res < 0)
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goto nla_put_failure;
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rcu_read_lock();
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port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
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if (port)
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res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX,
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port->dev->ifindex);
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rcu_read_unlock();
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if (res < 0)
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goto nla_put_failure;
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@ -328,20 +327,22 @@ static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
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res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq);
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if (res < 0)
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goto nla_put_failure;
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rcu_read_lock();
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port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
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if (port)
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res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX,
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port->dev->ifindex);
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rcu_read_unlock();
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if (res < 0)
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goto nla_put_failure;
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rcu_read_unlock();
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genlmsg_end(skb_out, msg_head);
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genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
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return 0;
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rcu_unlock:
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rcu_read_unlock();
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invalid:
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netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
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return 0;
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@ -351,6 +352,7 @@ static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
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/* Fall through */
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fail:
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rcu_read_unlock();
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return res;
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}
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@ -377,15 +379,16 @@ static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
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if (!na)
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goto invalid;
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hsr_dev = __dev_get_by_index(genl_info_net(info),
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nla_get_u32(info->attrs[HSR_A_IFINDEX]));
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rcu_read_lock();
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hsr_dev = dev_get_by_index_rcu(genl_info_net(info),
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nla_get_u32(info->attrs[HSR_A_IFINDEX]));
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if (!hsr_dev)
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goto invalid;
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goto rcu_unlock;
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if (!is_hsr_master(hsr_dev))
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goto invalid;
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goto rcu_unlock;
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/* Send reply */
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skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
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if (!skb_out) {
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res = -ENOMEM;
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goto fail;
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@ -405,14 +408,11 @@ static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
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hsr = netdev_priv(hsr_dev);
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rcu_read_lock();
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pos = hsr_get_next_node(hsr, NULL, addr);
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while (pos) {
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res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr);
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if (res < 0) {
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rcu_read_unlock();
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if (res < 0)
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goto nla_put_failure;
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}
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pos = hsr_get_next_node(hsr, pos, addr);
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}
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rcu_read_unlock();
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@ -422,6 +422,8 @@ static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
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return 0;
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rcu_unlock:
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rcu_read_unlock();
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invalid:
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netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
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return 0;
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@ -431,6 +433,7 @@ static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
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/* Fall through */
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fail:
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rcu_read_unlock();
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return res;
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}
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