sctp: Allow struct sctp_event_subscribe to grow without breaking binaries
[linux-3.10.git] / net / sctp / socket.c
index 06b42b7..92ba71d 100644 (file)
@@ -4133,9 +4133,10 @@ static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
                                  int __user *optlen)
 {
-       if (len < sizeof(struct sctp_event_subscribe))
+       if (len <= 0)
                return -EINVAL;
-       len = sizeof(struct sctp_event_subscribe);
+       if (len > sizeof(struct sctp_event_subscribe))
+               len = sizeof(struct sctp_event_subscribe);
        if (put_user(len, optlen))
                return -EFAULT;
        if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))