netdev - [PATCH AUTOSEL 4.9 13/16] can: bcm: check the result of can_send() in bcm_can

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Message-Id: <20221009222713.1220394-13-sashal@kernel.org>
Date:   Sun,  9 Oct 2022 18:27:09 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ziyang Xuan <william.xuanziyang@...wei.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Sasha Levin <sashal@...nel.org>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 13/16] can: bcm: check the result of can_send() in bcm_can_tx()

From: Ziyang Xuan <william.xuanziyang@...wei.com>

[ Upstream commit 3fd7bfd28cfd68ae80a2fe92ea1615722cc2ee6e ]

If can_send() fail, it should not update frames_abs counter
in bcm_can_tx(). Add the result check for can_send() in bcm_can_tx().

Suggested-by: Marc Kleine-Budde <mkl@...gutronix.de>
Suggested-by: Oliver Hartkopp <socketcan@...tkopp.net>
Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com>
Link: https://lore.kernel.org/all/9851878e74d6d37aee2f1ee76d68361a46f89458.1663206163.git.william.xuanziyang@huawei.com
Acked-by: Oliver Hartkopp <socketcan@...tkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/can/bcm.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/can/bcm.c b/net/can/bcm.c
index bfb507223468..ece04ad50348 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -285,6 +285,7 @@ static void bcm_can_tx(struct bcm_op *op)
 	struct sk_buff *skb;
 	struct net_device *dev;
 	struct canfd_frame *cf = op->frames + op->cfsiz * op->currframe;
+	int err;
 
 	/* no target device? => exit */
 	if (!op->ifindex)
@@ -309,11 +310,11 @@ static void bcm_can_tx(struct bcm_op *op)
 	/* send with loopback */
 	skb->dev = dev;
 	can_skb_set_owner(skb, op->sk);
-	can_send(skb, 1);
+	err = can_send(skb, 1);
+	if (!err)
+		op->frames_abs++;
 
-	/* update statistics */
 	op->currframe++;
-	op->frames_abs++;
 
 	/* reached last frame? */
 	if (op->currframe >= op->nframes)
-- 
2.35.1