linux-kernel - [PATCH 4.7 031/143] usb: misc: usbtest: usbtest_do

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Date:   Mon,  5 Sep 2016 18:43:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Peter Chen <peter.chen@....com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>
Subject: [PATCH 4.7 031/143] usb: misc: usbtest: usbtest_do_ioctl may return positive integer

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

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

From: Peter Chen <peter.chen@....com>

commit 528d28138f91009f230903bd89ccd44719667831 upstream.

For case 14 and case 21, their correct return value is the number
of bytes transferred, so it is a positive integer. But in usbtest_ioctl,
it takes non-zero as false return value for usbtest_do_ioctl, so
it will treat the correct test as wrong test, then the time on
tests will be the minus value.

Signed-off-by: Peter Chen <peter.chen@....com>
Fixes: 18fc4ebdc705 ("usb: misc: usbtest: Remove timeval usage")
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/misc/usbtest.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -2603,7 +2603,7 @@ usbtest_ioctl(struct usb_interface *intf
 	ktime_get_ts64(&start);
 
 	retval = usbtest_do_ioctl(intf, param_32);
-	if (retval)
+	if (retval < 0)
 		goto free_mutex;
 
 	ktime_get_ts64(&end);