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From:   Zhang Changzhong <zhangchangzhong@huawei.com>
To:     Wolfgang Grandegger <wg@grandegger.com>,
        Marc Kleine-Budde <mkl@pengutronix.de>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, Julia Lawall <julia@diku.dk>,
        Pavel Cheblakov <P.B.Cheblakov@inp.nsk.su>
CC:     Zhang Changzhong <zhangchangzhong@huawei.com>,
        <linux-can@vger.kernel.org>, <netdev@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH] can: sja1000: plx_pci: fix error handling path in plx_pci_add_card()
Date:   Mon, 21 Nov 2022 19:10:30 +0800
Message-ID: <1669029031-7743-1-git-send-email-zhangchangzhong@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

If pci_iomap() or register_sja1000dev() fails, netdev will not be
registered, but plx_pci_del_card() still deregisters the netdev.

To avoid this, let's free the netdev and clear card->net_dev[i] before
calling plx_pci_del_card(). In addition, add the missing pci_iounmap()
when the channel does not exist.

Compile tested only.

Fixes: 951f2f960e5b ("drivers/net/can/sja1000/plx_pci.c: eliminate double free")
Fixes: 24c4a3b29255 ("can: add support for CAN interface cards based on the PLX90xx PCI bridge")
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
---
 drivers/net/can/sja1000/plx_pci.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/can/sja1000/plx_pci.c b/drivers/net/can/sja1000/plx_pci.c
index 5de1ebb..1158f5a 100644
--- a/drivers/net/can/sja1000/plx_pci.c
+++ b/drivers/net/can/sja1000/plx_pci.c
@@ -678,6 +678,8 @@ static int plx_pci_add_card(struct pci_dev *pdev,
 		if (!addr) {
 			err = -ENOMEM;
 			dev_err(&pdev->dev, "Failed to remap BAR%d\n", cm->bar);
+			free_sja1000dev(dev);
+			card->net_dev[i] = NULL;
 			goto failure_cleanup;
 		}
 
@@ -699,6 +701,9 @@ static int plx_pci_add_card(struct pci_dev *pdev,
 			if (err) {
 				dev_err(&pdev->dev, "Registering device failed "
 					"(err=%d)\n", err);
+				pci_iounmap(pdev, priv->reg_base);
+				free_sja1000dev(dev);
+				card->net_dev[i] = NULL;
 				goto failure_cleanup;
 			}
 
@@ -710,6 +715,7 @@ static int plx_pci_add_card(struct pci_dev *pdev,
 		} else {
 			dev_err(&pdev->dev, "Channel #%d not detected\n",
 				i + 1);
+			pci_iounmap(pdev, priv->reg_base);
 			free_sja1000dev(dev);
 			card->net_dev[i] = NULL;
 		}
-- 
2.9.5