releases/4.4.46/can-c_can_pci-fix-null-pointer-deref-in-c_can_start-set-device-pointer.patch

   1 From c97c52be78b8463ac5407f1cf1f22f8f6cf93a37 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Einar=20J=C3=B3n?= <tolvupostur@gmail.com>
   3 Date: Fri, 12 Aug 2016 13:50:41 +0200
   4 Subject: can: c_can_pci: fix null-pointer-deref in c_can_start() - set device pointer
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 From: Einar Jón <tolvupostur@gmail.com>
  10
  11 commit c97c52be78b8463ac5407f1cf1f22f8f6cf93a37 upstream.
  12
  13 The priv->device pointer for c_can_pci is never set, but it is used
  14 without a NULL check in c_can_start(). Setting it in c_can_pci_probe()
  15 like c_can_plat_probe() prevents c_can_pci.ko from crashing, with and
  16 without CONFIG_PM.
  17
  18 This might also cause the pm_runtime_*() functions in c_can.c to
  19 actually be executed for c_can_pci devices - they are the only other
  20 place where priv->device is used, but they all contain a null check.
  21
  22 Signed-off-by: Einar Jón <tolvupostur@gmail.com>
  23 Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
  24 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  25
  26 ---
  27  drivers/net/can/c_can/c_can_pci.c |    1 +
  28  1 file changed, 1 insertion(+)
  29
  30 --- a/drivers/net/can/c_can/c_can_pci.c
  31 +++ b/drivers/net/can/c_can/c_can_pci.c
  32 @@ -161,6 +161,7 @@ static int c_can_pci_probe(struct pci_de
  33
  34         dev->irq = pdev->irq;
  35         priv->base = addr;
  36 +       priv->device = &pdev->dev;
  37
  38         if (!c_can_pci_data->freq) {
  39                 dev_err(&pdev->dev, "no clock frequency defined\n");