linux-kernel - [PATCH 4.4 61/86] Input: xpad - validate USB endpoint type during probe

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Date:   Thu, 29 Nov 2018 15:12:26 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andrey Konovalov <andreyknvl@...gle.com>,
        Cameron Gutman <aicommander@...il.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 61/86] Input: xpad - validate USB endpoint type during probe

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

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

[ Upstream commit 122d6a347329818419b032c5a1776e6b3866d9b9 ]

We should only see devices with interrupt endpoints. Ignore any other
endpoints that we find, so we don't send try to send them interrupt URBs
and trigger a WARN down in the USB stack.

Reported-by: Andrey Konovalov <andreyknvl@...gle.com>
Tested-by: Andrey Konovalov <andreyknvl@...gle.com>
Cc: <stable@...r.kernel.org> # c01b5e7464f0 Input: xpad - don't depend on endpoint order
Signed-off-by: Cameron Gutman <aicommander@...il.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/input/joystick/xpad.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c
index f8e34ef643c7..d86e59515b9c 100644
--- a/drivers/input/joystick/xpad.c
+++ b/drivers/input/joystick/xpad.c
@@ -1764,10 +1764,12 @@ static int xpad_probe(struct usb_interface *intf, const struct usb_device_id *id
 		struct usb_endpoint_descriptor *ep =
 				&intf->cur_altsetting->endpoint[i].desc;
 
-		if (usb_endpoint_dir_in(ep))
-			ep_irq_in = ep;
-		else
-			ep_irq_out = ep;
+		if (usb_endpoint_xfer_int(ep)) {
+			if (usb_endpoint_dir_in(ep))
+				ep_irq_in = ep;
+			else
+				ep_irq_out = ep;
+		}
 	}
 
 	if (!ep_irq_in || !ep_irq_out) {
-- 
2.17.1