linux-kernel - [PATCH 1/2 v4] usb: gadget: net2280: Fix NULL pointer dereference

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Message-Id: <1400156926-11100-1-git-send-email-ricardo.ribalda@gmail.com>
Date:	Thu, 15 May 2014 14:28:45 +0200
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	balbi@...com, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	joe@...ches.com, auttamchandani@...icube.com
Cc:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH 1/2 v4] usb: gadget: net2280: Fix NULL pointer dereference

When DEBUG is enabled driver->driver.name is accessed, but driver
can be NULL

[  174.411689] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040
[  174.429043] RIP: 0010:[<ffffffffa0131ca3>]  [<ffffffffa0131ca3>] net2280_stop+0xa3/0x100 [net2280]
[  174.457910] Call Trace:
[  174.459503]  [<ffffffffa00dd92a>] usb_gadget_remove_driver+0x5a/0xb0 [udc_core]
[  174.462693]  [<ffffffffa00ddd84>] usb_del_gadget_udc+0xb4/0x110 [udc_core]
[  174.464316]  [<ffffffffa012e2bf>] net2280_remove+0x2f/0x1c0 [net2280]

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
v4: Replace if with terniary operator

 drivers/usb/gadget/net2280.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/net2280.c b/drivers/usb/gadget/net2280.c
index 43e5e2f..300b3a7 100644
--- a/drivers/usb/gadget/net2280.c
+++ b/drivers/usb/gadget/net2280.c
@@ -1972,7 +1972,9 @@ static int net2280_stop(struct usb_gadget *_gadget,
 	device_remove_file (&dev->pdev->dev, &dev_attr_function);
 	device_remove_file (&dev->pdev->dev, &dev_attr_queues);
 
-	DEBUG (dev, "unregistered driver '%s'\n", driver->driver.name);
+	DEBUG(dev, "unregistered driver '%s'\n",
+			driver ? driver->driver.name : "");
+
 	return 0;
 }
 
-- 
2.0.0.rc0

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