[PATCH 1/2] usb: gadget: net2280: Fix NULL pointer dereference

[Ricardo Ribalda Delgado]

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@xxxxxxxxx>
---
 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..4978e63 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);
+	if (driver)
+		DEBUG(dev, "unregistered driver '%s'\n", driver->driver.name);
+
 	return 0;
 }
 
-- 
2.0.0.rc0

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