linux-kernel - [PATCH 4.3 16/55] USB: host: ohci-at91: fix a crash in ohci_hcd_at91_overcurrent

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Message-Id: <20160120232228.273517096@linuxfoundation.org>
Date:	Wed, 20 Jan 2016 16:43:51 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Peter Rosin <peda@...ntia.se>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Alan Stern <stern@...land.harvard.edu>
Subject: [PATCH 4.3 16/55] USB: host: ohci-at91: fix a crash in ohci_hcd_at91_overcurrent_irq

4.3-stable review patch.  If anyone has any objections, please let me know.

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

From: Alexandre Belloni <alexandre.belloni@...e-electrons.com>

commit 4a0c4c36094cefd85cbe489590382ef69516ccef upstream.

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@...ntia.se>
Tested-by: Peter Rosin <peda@...ntia.se>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/host/ohci-at91.c |   11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

--- 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(struc
 	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(struc
 		 */
 		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(struc
 	}
 
 	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(struc
 		}
 	}
 
-	pdev->dev.platform_data = pdata;
-
 	device_init_wakeup(&pdev->dev, 1);
 	return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
 }