[DCCP] ACKVEC: fix ackvector length calculation
Fix ackvector length calculation upon receiving an "ack-of-ack". This
patch avoids the ackvector from growing too large which causes it to
not be inserted into packets.
Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/dccp/ackvec.c b/net/dccp/ackvec.c
index 8c211c5..8dab723 100644
--- a/net/dccp/ackvec.c
+++ b/net/dccp/ackvec.c
@@ -353,11 +353,13 @@
{
struct dccp_ackvec_record *next;
- av->dccpav_buf_tail = avr->dccpavr_ack_ptr - 1;
- if (av->dccpav_buf_tail == 0)
- av->dccpav_buf_tail = DCCP_MAX_ACKVEC_LEN - 1;
-
- av->dccpav_vec_len -= avr->dccpavr_sent_len;
+ /* sort out vector length */
+ if (av->dccpav_buf_head <= avr->dccpavr_ack_ptr)
+ av->dccpav_vec_len = avr->dccpavr_ack_ptr - av->dccpav_buf_head;
+ else
+ av->dccpav_vec_len = DCCP_MAX_ACKVEC_LEN - 1
+ - av->dccpav_buf_head
+ + avr->dccpavr_ack_ptr;
/* free records */
list_for_each_entry_safe_from(avr, next, &av->dccpav_records,