linux-kernel - [PATCH] usbip: vudc: check for NULL before use

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Date:   Sun, 18 Dec 2016 22:44:51 +0000
From:   Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:     Valentina Manea <valentina.manea.m@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        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] usbip: vudc: check for NULL before use

to_vep() is doing a container_of() on _ep. It is better to do the NULL
check first and then use it.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
---
 drivers/usb/usbip/vudc_dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/usbip/vudc_dev.c b/drivers/usb/usbip/vudc_dev.c
index 968471b..32ea604 100644
--- a/drivers/usb/usbip/vudc_dev.c
+++ b/drivers/usb/usbip/vudc_dev.c
@@ -388,10 +388,10 @@ static int vep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 	unsigned long flags;
 	int ret = 0;
 
-	ep = to_vep(_ep);
 	if (!_ep)
 		return -EINVAL;
 
+	ep = to_vep(_ep);
 	udc = ep_to_vudc(ep);
 	if (!udc->driver)
 		return -ESHUTDOWN;
-- 
1.9.1