On 3/2/06, David S. Miller <davem@xxxxxxxxxxxxx> wrote:
>
> This tree was getting crufty, so I rebased it today.
> It was actually a lot easier than I had anticipated.
>
> master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6.17.git
>
Dave,
If you get a chance can you push the ccid3 divide by zero fix upstream
to Linus for 2.6.16 as it has no functionality changed and eliminates
a nasty little bug...
The commit for this is b6da19617f4ab610d3d90bcbdf65fa7e2b3d7b53 in your tree
I have also put at end of this e-mail after reapplying on linus tree
so above commit doesn't have fuzz...
[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@xxxxxxxxx>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxx>
--- 2b82f96f1291c42ee9485465801f5f51897bec64
+++ ff426a9009993445a15cfcac6c88be1e39e07913
@@ -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@xxxxxxxxxxxxxxxx>
+ * Copyright (c) 2005-6 Ian McDonald <imcdnzl@xxxxxxxxx>
*
* An implementation of the DCCP protocol
*
@@ -1014,9 +1014,13 @@ static void ccid3_hc_rx_packet_recv(stru
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);
-
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