Ensure ssthresh >= 2*MSS

16 years ago · 95445fc328
2 changed files with 4 additions and 2 deletions
--- a/2
+++ b/2
@ -56,6 +56,8 @@ HISTORY


  ++ Bugfixes:
+  2010-01-28: Kieran Mansley
+  * tcp.c: Ensure ssthresh >= 2*MSS

  2010-01-27: Simon Goldschmidt
  * tcp.h, tcp.c, tcp_in.c: Fixed bug #27871: Calling tcp_abort() in recv
--- a/src/core/tcp.c
+++ b/src/core/tcp.c
@ -650,8 +650,8 @@ tcp_slowtmr(void)
          /* Reduce congestion window and ssthresh. */
          eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
          pcb->ssthresh = eff_wnd >> 1;
-          if (pcb->ssthresh < pcb->mss) {
-            pcb->ssthresh = pcb->mss * 2;
+          if (pcb->ssthresh < (pcb->mss << 1)) {
+            pcb->ssthresh = (pcb->mss << 1);
          }
          pcb->cwnd = pcb->mss;
          LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F