linux-kernel - [PATCH 29/93] usb: ehci-mxc: check for pdata before dereferencing

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Message-Id: <1379707768-1804-30-git-send-email-kamal@canonical.com>
Date:	Fri, 20 Sep 2013 13:08:24 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Daniel Mack <zonque@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 29/93] usb: ehci-mxc: check for pdata before dereferencing

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

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

From: Daniel Mack <zonque@...il.com>

commit f375fc520d4df0cd9fcb570f33c103c6c0311f9e upstream.

Commit 7e8d5cd93fac ("USB: Add EHCI support for MX27 and MX31 based
boards") introduced code that could potentially lead to a NULL pointer
dereference on driver removal.

Fix this by checking for the value of pdata before dereferencing it.

Signed-off-by: Daniel Mack <zonque@...il.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/usb/host/ehci-mxc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/ehci-mxc.c b/drivers/usb/host/ehci-mxc.c
index dedb80b..f4f032e 100644
--- a/drivers/usb/host/ehci-mxc.c
+++ b/drivers/usb/host/ehci-mxc.c
@@ -211,7 +211,7 @@ static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
 	if (pdata && pdata->exit)
 		pdata->exit(pdev);
 
-	if (pdata->otg)
+	if (pdata && pdata->otg)
 		usb_phy_shutdown(pdata->otg);
 
 	clk_disable_unprepare(priv->usbclk);
-- 
1.8.1.2

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