linux-kernel - [PATCH] USB: OHCI: Check the overrides pointer for NULL in ohci_init

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Message-Id: <1380390989-4740-1-git-send-email-tomasz.figa@gmail.com>
Date:	Sat, 28 Sep 2013 19:56:29 +0200
From:	Tomasz Figa <tomasz.figa@...il.com>
To:	linux-usb@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Manjunath Goudar <manjunath.goudar@...aro.org>,
	Tomasz Figa <tomasz.figa@...il.com>
Subject: [PATCH] USB: OHCI: Check the overrides pointer for NULL in ohci_init_driver()

A series of commit starting at

50a97e059b USB: OHCI: make ohci-exynos a separate driver

and ending at

b8ad5c3706 USB: OHCI: make ohci-pxa27x a separate driver

introduced the concept of separate OHCI drivers for particular
controllers. Respective drivers need to call ohci_init_driver() to
initialize hc_driver struct with generic data and to certain extent
with platform specific overrides through ohci_driver_overrides struct
passed as second argument to this function. However the code does not
check if the ohci_driver_overrides struct pointer is non-NULL, which
leads for a NULL pointer dereference for drivers that do not need any
overrides.

This patch fixes the problem by dereferencing the passed pointer to
ohci_driver_overrides struct only if it is non-NULL.

Signed-off-by: Tomasz Figa <tomasz.figa@...il.com>
---
 drivers/usb/host/ohci-hcd.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 21d937a..8ada13f 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -1161,10 +1161,12 @@ void ohci_init_driver(struct hc_driver *drv,
 	/* Copy the generic table to drv and then apply the overrides */
 	*drv = ohci_hc_driver;
 
-	drv->product_desc = over->product_desc;
-	drv->hcd_priv_size += over->extra_priv_size;
-	if (over->reset)
-		drv->reset = over->reset;
+	if (over) {
+		drv->product_desc = over->product_desc;
+		drv->hcd_priv_size += over->extra_priv_size;
+		if (over->reset)
+			drv->reset = over->reset;
+	}
 }
 EXPORT_SYMBOL_GPL(ohci_init_driver);
 
-- 
1.8.3.2

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