linux-kernel - [PATCH 3.16 233/370] can: c_can_pci: fix null-pointer-deref in c_can_start()

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Message-ID: <lsq.1489146383.861789289@decadent.org.uk>
Date:   Fri, 10 Mar 2017 11:46:23 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Marc Kleine-Budde" <mkl@...gutronix.de>,
        "Einar Jón" <tolvupostur@...il.com>
Subject: [PATCH 3.16 233/370] can: c_can_pci: fix null-pointer-deref in
 c_can_start() - set device pointer

3.16.42-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Einar Jón <tolvupostur@...il.com>

commit c97c52be78b8463ac5407f1cf1f22f8f6cf93a37 upstream.

The priv->device pointer for c_can_pci is never set, but it is used
without a NULL check in c_can_start(). Setting it in c_can_pci_probe()
like c_can_plat_probe() prevents c_can_pci.ko from crashing, with and
without CONFIG_PM.

This might also cause the pm_runtime_*() functions in c_can.c to
actually be executed for c_can_pci devices - they are the only other
place where priv->device is used, but they all contain a null check.

Signed-off-by: Einar Jón <tolvupostur@...il.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/can/c_can/c_can_pci.c | 1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/can/c_can/c_can_pci.c
+++ b/drivers/net/can/c_can/c_can_pci.c
@@ -161,6 +161,7 @@ static int c_can_pci_probe(struct pci_de

 	dev->irq = pdev->irq;
 	priv->base = addr;
+	priv->device = &pdev->dev;

 	if (!c_can_pci_data->freq) {
 		dev_err(&pdev->dev, "no clock frequency defined\n");