Merge git://git.infradead.org/users/dwmw2/mtd-2.6.38

[mv-sheeva.git] / net / ipv4 / tcp_input.c

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index eb7f82ebf4a325a1199bbe5610cd4191bc6e2df5..65f6c04062453aefdffa2317781921990616e796 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1222,7 +1222,7 @@ static int tcp_check_dsack(struct sock *sk, struct sk_buff *ack_skb,
        }
 
        /* D-SACK for already forgotten data... Do dumb counting. */
-       if (dup_sack &&
+       if (dup_sack && tp->undo_marker && tp->undo_retrans &&
            !after(end_seq_0, prior_snd_una) &&
            after(end_seq_0, tp->undo_marker))
                tp->undo_retrans--;
@@ -1299,7 +1299,8 @@ static u8 tcp_sacktag_one(struct sk_buff *skb, struct sock *sk,
 
        /* Account D-SACK for retransmitted packet. */
        if (dup_sack && (sacked & TCPCB_RETRANS)) {
-               if (after(TCP_SKB_CB(skb)->end_seq, tp->undo_marker))
+               if (tp->undo_marker && tp->undo_retrans &&
+                   after(TCP_SKB_CB(skb)->end_seq, tp->undo_marker))
                        tp->undo_retrans--;
                if (sacked & TCPCB_SACKED_ACKED)
                        state->reord = min(fack_count, state->reord);