can: bcm: check the result of can_send() in bcm_can_tx()

BugLink: https://bugs.launchpad.net/bugs/1996825
[ 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@pengutronix.de>
Suggested-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Link: https://lore.kernel.org/all/9851878e74d6d37aee2f1ee76d68361a46f89458.1663206163.git.william.xuanziyang@huawei.com
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/net/can/bcm.c b/net/can/bcm.c
index e5ffd2bd62ab81e49adb5643de65425d0432a4fb..aab3a18f4a90f709e498e6765c1f9901682c9fc4 100644 (file)
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -274,6 +274,7 @@ 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)
@@ -298,11 +299,11 @@ 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)