linux-kernel - [PATCH] usb: usbip: fix null pointer dereference

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Date:	Thu,  2 Jun 2016 18:52:33 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Valentina Manea <valentina.manea.m@...il.com>,
	Shuah Khan <shuah.kh@...sung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH] usb: usbip: fix null pointer dereference

We have been dereferencing udc before checking it. Lets use it after it
has been checked.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
---
 drivers/usb/usbip/vudc_sysfs.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/usbip/vudc_sysfs.c b/drivers/usb/usbip/vudc_sysfs.c
index 99397fa..0ba6a06 100644
--- a/drivers/usb/usbip/vudc_sysfs.c
+++ b/drivers/usb/usbip/vudc_sysfs.c
@@ -35,14 +35,17 @@
 int get_gadget_descs(struct vudc *udc)
 {
 	struct vrequest *usb_req;
-	struct vep *ep0 = to_vep(udc->gadget.ep0);
-	struct usb_device_descriptor *ddesc = &udc->dev_desc;
+	struct vep *ep0;
+	struct usb_device_descriptor *ddesc;
 	struct usb_ctrlrequest req;
 	int ret;
 
 	if (!udc || !udc->driver || !udc->pullup)
 		return -EINVAL;
 
+	ep0 = to_vep(udc->gadget.ep0);
+	ddesc = &udc->dev_desc;
+
 	req.bRequestType = USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE;
 	req.bRequest = USB_REQ_GET_DESCRIPTOR;
 	req.wValue = cpu_to_le16(USB_DT_DEVICE << 8);
-- 
1.9.1