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-rw-r--r--net/mptcp/diag.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/net/mptcp/diag.c b/net/mptcp/diag.c
index a53658674..7017dd606 100644
--- a/net/mptcp/diag.c
+++ b/net/mptcp/diag.c
@@ -13,17 +13,22 @@
#include <uapi/linux/mptcp.h>
#include "protocol.h"
-static int subflow_get_info(const struct sock *sk, struct sk_buff *skb)
+static int subflow_get_info(struct sock *sk, struct sk_buff *skb)
{
struct mptcp_subflow_context *sf;
struct nlattr *start;
u32 flags = 0;
+ bool slow;
int err;
+ if (inet_sk_state_load(sk) == TCP_LISTEN)
+ return 0;
+
start = nla_nest_start_noflag(skb, INET_ULP_INFO_MPTCP);
if (!start)
return -EMSGSIZE;
+ slow = lock_sock_fast(sk);
rcu_read_lock();
sf = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
if (!sf) {
@@ -63,17 +68,19 @@ static int subflow_get_info(const struct sock *sk, struct sk_buff *skb)
sf->map_data_len) ||
nla_put_u32(skb, MPTCP_SUBFLOW_ATTR_FLAGS, flags) ||
nla_put_u8(skb, MPTCP_SUBFLOW_ATTR_ID_REM, sf->remote_id) ||
- nla_put_u8(skb, MPTCP_SUBFLOW_ATTR_ID_LOC, sf->local_id)) {
+ nla_put_u8(skb, MPTCP_SUBFLOW_ATTR_ID_LOC, subflow_get_local_id(sf))) {
err = -EMSGSIZE;
goto nla_failure;
}
rcu_read_unlock();
+ unlock_sock_fast(sk, slow);
nla_nest_end(skb, start);
return 0;
nla_failure:
rcu_read_unlock();
+ unlock_sock_fast(sk, slow);
nla_nest_cancel(skb, start);
return err;
}