netdev - [PATCH net-next 01/22] can: janz-ican3: initialize dlc variable

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Message-Id: <20220108214345.1848470-2-mkl@pengutronix.de>
Date:   Sat,  8 Jan 2022 22:43:24 +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, Tom Rix <trix@...hat.com>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 01/22] can: janz-ican3: initialize dlc variable

From: Tom Rix <trix@...hat.com>

Clang static analysis reports this problem
janz-ican3.c:1311:2: warning: Undefined or garbage value returned to caller
        return dlc;
        ^~~~~~~~~~

dlc is only set with this conditional
	if (!(cf->can_id & CAN_RTR_FLAG))
		dlc = cf->len;

But is always returned.  So initialize dlc to 0.

Fixes: cc4b08c31b5c ("can: do not increase tx_bytes statistics for RTR frames")
Link: https://lore.kernel.org/all/20220108143319.3986923-1-trix@redhat.com
Signed-off-by: Tom Rix <trix@...hat.com>
Acked-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/janz-ican3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index 5b677af5f2a4..808c105cf8f7 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -1285,7 +1285,7 @@ static unsigned int ican3_get_echo_skb(struct ican3_dev *mod)
 {
 	struct sk_buff *skb = skb_dequeue(&mod->echoq);
 	struct can_frame *cf;
-	u8 dlc;
+	u8 dlc = 0;
 
 	/* this should never trigger unless there is a driver bug */
 	if (!skb) {

base-commit: 82192cb497f9eca6c0d44dbc173e68d59ea2f3c9
-- 
2.34.1