sctp: Error in calculation of RTTvar

[mirror_ubuntu-artful-kernel.git] / net / sctp / transport.c

diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index 953c21e4af977a752362187976e84b578bdb085c..206cf5238fd3ef00183f87e52734398ab475fbdb 100644 (file)
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -331,7 +331,7 @@ void sctp_transport_update_rto(struct sctp_transport *tp, __u32 rtt)
                 * 1/8, rto_alpha would be expressed as 3.
                 */
                tp->rttvar = tp->rttvar - (tp->rttvar >> net->sctp.rto_beta)
-                       + ((abs(tp->srtt - rtt)) >> net->sctp.rto_beta);
+                       + (((__u32)abs64((__s64)tp->srtt - (__s64)rtt)) >> net->sctp.rto_beta);
                tp->srtt = tp->srtt - (tp->srtt >> net->sctp.rto_alpha)
                        + (rtt >> net->sctp.rto_alpha);
        } else {