1 files changed, 10 insertions, 0 deletions

diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h
index da0ca3c0a7b3..3fa0f69ed320 100644
--- a/net/dccp/ccids/ccid3.h
+++ b/net/dccp/ccids/ccid3.h
@@ -51,6 +51,16 @@
 /* Parameter t_mbi from [RFC 3448, 4.3]: backoff interval in seconds */
 #define TFRC_T_MBI                 64
 
+/* What we think is a reasonable upper limit on RTT values */
+#define CCID3_SANE_RTT_MAX         (4 * USEC_PER_SEC)
+
+#define CCID3_RTT_SANITY_CHECK(rtt)                     do {               \
+                if (rtt > CCID3_SANE_RTT_MAX) {                            \
+                        DCCP_CRIT("RTT (%ld) too large, substituting %ld", \
+                                  rtt, CCID3_SANE_RTT_MAX);                \
+                        rtt = CCID3_SANE_RTT_MAX;                          \
+                }                                       } while (0)
+
 enum ccid3_options {
         TFRC_OPT_LOSS_EVENT_RATE = 192,
         TFRC_OPT_LOSS_INTERVALS  = 193,