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authorIan McDonald <imcdnzl@gmail.com>2006-03-03 17:54:46 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-03-04 21:06:29 -0800
commitc09966608da7e8cad3468e925ac9062e44fee831 (patch)
tree4e3b04e3aabe5bf5106fe04913ad7b75525d7de4 /net
parentc027f5f995d8b6efc934be384085e3e8425638e4 (diff)
[DCCP] ccid3: Divide by zero fix
In rare circumstances 0 is returned by dccp_li_hist_calc_i_mean which leads to a divide by zero in ccid3_hc_rx_packet_recv. Explicitly check for zero return now. Update copyright notice at same time. Found by Arnaldo. Signed-off-by: Ian McDonald <imcdnzl@gmail.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/dccp/ccids/ccid3.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index aa68e0ab274..35d1d347541 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -2,7 +2,7 @@
* net/dccp/ccids/ccid3.c
*
* Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
- * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
+ * Copyright (c) 2005-6 Ian McDonald <imcdnzl@gmail.com>
*
* An implementation of the DCCP protocol
*
@@ -1033,9 +1033,13 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
p_prev = hcrx->ccid3hcrx_p;
/* Calculate loss event rate */
- if (!list_empty(&hcrx->ccid3hcrx_li_hist))
+ if (!list_empty(&hcrx->ccid3hcrx_li_hist)) {
+ u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist);
+
/* Scaling up by 1000000 as fixed decimal */
- hcrx->ccid3hcrx_p = 1000000 / dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist);
+ if (i_mean != 0)
+ hcrx->ccid3hcrx_p = 1000000 / i_mean;
+ }
if (hcrx->ccid3hcrx_p > p_prev) {
ccid3_hc_rx_send_feedback(sk);