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-rw-r--r--net/mptcp/subflow.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index a4cc4591bd4e..96f4f2fe50ad 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -1137,6 +1137,12 @@ int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock)
struct socket *sf;
int err;
+ /* un-accepted server sockets can reach here - on bad configuration
+ * bail early to avoid greater trouble later
+ */
+ if (unlikely(!sk->sk_socket))
+ return -EINVAL;
+
err = sock_create_kern(net, sk->sk_family, SOCK_STREAM, IPPROTO_TCP,
&sf);
if (err)