net: hold rtnl again in dump callbacks

[platform/adaptation/renesas_rcar/renesas_kernel.git] / net / core / rtnetlink.c

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index d1644e3..2d56cb9 100644 (file)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -850,6 +850,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
        struct nlattr *attr, *af_spec;
        struct rtnl_af_ops *af_ops;
 
+       ASSERT_RTNL();
        nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
        if (nlh == NULL)
                return -EMSGSIZE;
@@ -1876,6 +1877,7 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
        int min_len;
        int family;
        int type;
+       int err;
 
        type = nlh->nlmsg_type;
        if (type > RTM_MAX)
@@ -1902,8 +1904,11 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
                if (dumpit == NULL)
                        return -EOPNOTSUPP;
 
+               __rtnl_unlock();
                rtnl = net->rtnl;
-               return netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
+               err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
+               rtnl_lock();
+               return err;
        }
 
        memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
@@ -1975,7 +1980,7 @@ static int __net_init rtnetlink_net_init(struct net *net)
 {
        struct sock *sk;
        sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
-                                  rtnetlink_rcv, NULL, THIS_MODULE);
+                                  rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
        if (!sk)
                return -ENOMEM;
        net->rtnl = sk;