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Date:   Tue, 11 Oct 2022 09:48:13 +0200
From:   Marc Kleine-Budde <>
Cc:,,,, Anssi Hannula <>,, Jimmy Assarsson <>,
        Marc Kleine-Budde <>
Subject: [PATCH net 2/4] can: kvaser_usb: Fix use of uninitialized completion

From: Anssi Hannula <>

flush_comp is initialized when CMD_FLUSH_QUEUE is sent to the device and
completed when the device sends CMD_FLUSH_QUEUE_RESP.

This causes completion of uninitialized completion if the device sends
CMD_FLUSH_QUEUE_RESP before CMD_FLUSH_QUEUE is ever sent (e.g. as a
response to a flush by a previously bound driver, or a misbehaving

Fix that by initializing flush_comp in kvaser_usb_init_one() like the
other completions.

This issue is only triggerable after RX URBs have been set up, i.e. the
interface has been opened at least once.

Fixes: aec5fb2268b7 ("can: kvaser_usb: Add support for Kvaser USB hydra family")
Tested-by: Jimmy Assarsson <>
Signed-off-by: Anssi Hannula <>
Signed-off-by: Jimmy Assarsson <>
Signed-off-by: Marc Kleine-Budde <>
 drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c  | 1 +
 drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
index 824cab80aa02..c2bce6773adc 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
@@ -729,6 +729,7 @@ static int kvaser_usb_init_one(struct kvaser_usb *dev, int channel)
+	init_completion(&priv->flush_comp);
 	priv->can.ctrlmode_supported = 0;
 	priv->dev = dev;
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
index 6871d474dabf..7b52fda73d82 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
@@ -1916,7 +1916,7 @@ static int kvaser_usb_hydra_flush_queue(struct kvaser_usb_net_priv *priv)
 	int err;
-	init_completion(&priv->flush_comp);
+	reinit_completion(&priv->flush_comp);
 	err = kvaser_usb_hydra_send_simple_cmd(priv->dev, CMD_FLUSH_QUEUE,

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