1 files changed, 6 insertions, 0 deletions

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index e13519e9df80..ff20e2dbbbc7 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2115,6 +2115,12 @@ static int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
                 sctp_skb_pull(skb, copied);
                 skb_queue_head(&sk->sk_receive_queue, skb);
 
+                /* When only partial message is copied to the user, increase
+                 * rwnd by that amount. If all the data in the skb is read,
+                 * rwnd is updated when the event is freed.
+                 */
+                if (!sctp_ulpevent_is_notification(event))
+                        sctp_assoc_rwnd_increase(event->asoc, copied);
                 goto out;
         } else if ((event->msg_flags & MSG_NOTIFICATION) ||
                    (event->msg_flags & MSG_EOR))