netdev - [PATCH net 5/5] can: gs_usb: gs_can_start_xmit(): zero-initialize hf->{flags,reserved}

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Message-Id: <20220109134040.1945428-6-mkl@pengutronix.de>
Date:   Sun,  9 Jan 2022 14:40:40 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de,
        Brian Silverman <brian.silverman@...erivertech.com>,
        stable@...r.kernel.org, Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net 5/5] can: gs_usb: gs_can_start_xmit(): zero-initialize hf->{flags,reserved}

From: Brian Silverman <brian.silverman@...erivertech.com>

No information is deliberately sent in hf->flags in host -> device
communications, but the open-source candleLight firmware echoes it
back, which can result in the GS_CAN_FLAG_OVERFLOW flag being set and
generating spurious ERRORFRAMEs.

While there also initialize the reserved member with 0.

Fixes: d08e973a77d1 ("can: gs_usb: Added support for the GS_USB CAN devices")
Link: https://lore.kernel.org/all/20220106002952.25883-1-brian.silverman@bluerivertech.com
Link: https://github.com/candle-usb/candleLight_fw/issues/87
Cc: stable@...r.kernel.org
Signed-off-by: Brian Silverman <brian.silverman@...erivertech.com>
[mkl: initialize the reserved member, too]
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/usb/gs_usb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index d7ce2c5956f4..4d43aca2ff56 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -508,6 +508,8 @@ static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
 
 	hf->echo_id = idx;
 	hf->channel = dev->channel;
+	hf->flags = 0;
+	hf->reserved = 0;
 
 	cf = (struct can_frame *)skb->data;
 
-- 
2.34.1