USB: host: ohci-at91: fix a crash in ohci_hcd_at91_overcurrent_irq

The interrupt handler, ohci_hcd_at91_overcurrent_irq may be called right
after registration. At that time, pdev->dev.platform_data is not yet set,
leading to a NULL pointer dereference.

Fixes: e4df92279fd9 (USB: host: ohci-at91: merge loops in ohci_hcd_at91_drv_probe)
Reported-by: Peter Rosin <peda@axentia.se>
Tested-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: stable@vger.kernel.org # 4.3+
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index 342ffd1..8c6e15b 100644 (file)
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -473,6 +473,8 @@ static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
        if (!pdata)
                return -ENOMEM;
 
+       pdev->dev.platform_data = pdata;
+
        if (!of_property_read_u32(np, "num-ports", &ports))
                pdata->ports = ports;
 
@@ -483,6 +485,7 @@ static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
                 */
                if (i >= pdata->ports) {
                        pdata->vbus_pin[i] = -EINVAL;
+                       pdata->overcurrent_pin[i] = -EINVAL;
                        continue;
                }
 
@@ -513,10 +516,8 @@ static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
        }
 
        at91_for_each_port(i) {
-               if (i >= pdata->ports) {
-                       pdata->overcurrent_pin[i] = -EINVAL;
-                       continue;
-               }
+               if (i >= pdata->ports)
+                       break;
 
                pdata->overcurrent_pin[i] =
                        of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);
@@ -552,8 +553,6 @@ static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
                }
        }
 
-       pdev->dev.platform_data = pdata;
-
        device_init_wakeup(&pdev->dev, 1);
        return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
 }