linux-kernel - [PATCH] can: etas_es58x: free netdev when register_candev() failed in es58x_init

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Message-ID: <1668396306-47940-1-git-send-email-zhangchangzhong@huawei.com>
Date:   Mon, 14 Nov 2022 11:25:05 +0800
From:   Zhang Changzhong <zhangchangzhong@...wei.com>
To:     Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        "Jakub Kicinski" <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Arunachalam Santhanam" <arunachalam.santhanam@...bosch.com>
CC:     Zhang Changzhong <zhangchangzhong@...wei.com>,
        <linux-can@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] can: etas_es58x: free netdev when register_candev() failed in es58x_init_netdev()

In case of register_candev() fails, clear es58x_dev->netdev[channel_idx]
and add free_candev(). Otherwise es58x_free_netdevs() will unregister
the netdev that has never been registered.

Fixes: 1dfb6005a60b ("can: etas_es58x: add support for ETAS ES581.4 CAN USB interface")
Signed-off-by: Zhang Changzhong <zhangchangzhong@...wei.com>
---
 drivers/net/can/usb/etas_es58x/es58x_core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/usb/etas_es58x/es58x_core.c b/drivers/net/can/usb/etas_es58x/es58x_core.c
index 25f863b..ddb7c57 100644
--- a/drivers/net/can/usb/etas_es58x/es58x_core.c
+++ b/drivers/net/can/usb/etas_es58x/es58x_core.c
@@ -2091,8 +2091,11 @@ static int es58x_init_netdev(struct es58x_device *es58x_dev, int channel_idx)
 	netdev->dev_port = channel_idx;
 
 	ret = register_candev(netdev);
-	if (ret)
+	if (ret) {
+		es58x_dev->netdev[channel_idx] = NULL;
+		free_candev(netdev);
 		return ret;
+	}
 
 	netdev_queue_set_dql_min_limit(netdev_get_tx_queue(netdev, 0),
 				       es58x_dev->param->dql_min_limit);
-- 
2.9.5