Currently dccp_check_seqno allows any valid packet to update the
Greatest Sequence Number Received, even if that packet's sequence number
is less than the current GSR. This patch adds a check to make sure that
the new packet's sequence number is greater than GSR.
>>>>>>>>>>>>>>>>>>>>>>>>> Patch Follows <<<<<<<<<<<<<<<<<<<<<<<<<<
diff --git a/net/dccp/input.c b/net/dccp/input.c
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -252,7 +253,10 @@ static int dccp_check_seqno(struct sock *sk, struct
sk_buff *skb)
if (between48(seqno, lswl, dp->dccps_swh) &&
(ackno == DCCP_PKT_WITHOUT_ACK_SEQ ||
between48(ackno, lawl, dp->dccps_awh))) {
- dccp_update_gsr(sk, seqno);
+
+ if(after48(seqno, dp->dccps_gsr)){
+ dccp_update_gsr(sk, seqno);
+ }
if (dh->dccph_type != DCCP_PKT_SYNC &&
ackno != DCCP_PKT_WITHOUT_ACK_SEQ &&
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