linux-kernel - [PATCH 4.11 094/197] [media] mceusb: fix NULL-deref at probe

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Date:   Tue, 23 May 2017 22:07:35 +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, Johan Hovold <johan@...nel.org>,
        Sean Young <sean@...s.org>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>
Subject: [PATCH 4.11 094/197] [media] mceusb: fix NULL-deref at probe

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

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

From: Johan Hovold <johan@...nel.org>

commit 03eb2a557ed552e920a0942b774aaf931596eec1 upstream.

Make sure to check for the required out endpoint to avoid dereferencing
a NULL-pointer in mce_request_packet should a malicious device lack such
an endpoint. Note that this path is hit during probe.

Fixes: 66e89522aff7 ("V4L/DVB: IR: add mceusb IR receiver driver")

Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Sean Young <sean@...s.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/rc/mceusb.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/media/rc/mceusb.c
+++ b/drivers/media/rc/mceusb.c
@@ -1288,8 +1288,8 @@ static int mceusb_dev_probe(struct usb_i
 			}
 		}
 	}
-	if (ep_in == NULL) {
-		dev_dbg(&intf->dev, "inbound and/or endpoint not found");
+	if (!ep_in || !ep_out) {
+		dev_dbg(&intf->dev, "required endpoints not found\n");
 		return -ENODEV;
 	}