[PATCH 5.10 03/23] batman-adv: tp_meter: initialize dec_cwnd explicitly

[Sven Eckelmann <sven@narfation.org>]

commit febfb1b86224489535312296ecfa3d4bf467f339 upstream.

When batadv_tp_update_cwnd() is called, dec_cwnd is increased. But dec_cwnd
is only initialixed (to 0) when a duplicate Ack was received or when cwnd
is below the ss_threshold.

Just initialize the cwnd during the initialization to avoid any potential
access of uninitialized data.

Cc: stable@kernel.org
Fixes: 33a3bb4a3345 ("batman-adv: throughput meter implementation")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
 net/batman-adv/tp_meter.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/batman-adv/tp_meter.c b/net/batman-adv/tp_meter.c
index 1699fb8f8c82d..d8ad58ccef260 100644
--- a/net/batman-adv/tp_meter.c
+++ b/net/batman-adv/tp_meter.c
@@ -1065,6 +1065,8 @@ void batadv_tp_start(struct batadv_priv *bat_priv, const u8 *dst,
 	 * soft_interface, hence its MTU
 	 */
 	tp_vars->cwnd = BATADV_TP_PLEN * 3;
+	tp_vars->dec_cwnd = 0;
+
 	/* at the beginning initialise the SS threshold to the biggest possible
 	 * window size, hence the AWND size
 	 */
-- 
2.47.3