linux-kernel - [PATCH 1/6] [media] dib0700: fix NULL-deref at probe

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Message-Id: <20170313125359.29394-2-johan@kernel.org>
Date:   Mon, 13 Mar 2017 13:53:54 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        stable <stable@...r.kernel.org>
Subject: [PATCH 1/6] [media] dib0700: fix NULL-deref at probe

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack endpoints.

Fixes: c4018fa2e4c0 ("[media] dib0700: fix RC support on Hauppauge
Nova-TD")
Cc: stable <stable@...r.kernel.org>     # 3.16
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/media/usb/dvb-usb/dib0700_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/usb/dvb-usb/dib0700_core.c b/drivers/media/usb/dvb-usb/dib0700_core.c
index dd5edd3a17ee..08acdd32e412 100644
--- a/drivers/media/usb/dvb-usb/dib0700_core.c
+++ b/drivers/media/usb/dvb-usb/dib0700_core.c
@@ -809,6 +809,9 @@ int dib0700_rc_setup(struct dvb_usb_device *d, struct usb_interface *intf)
 
 	/* Starting in firmware 1.20, the RC info is provided on a bulk pipe */
 
+	if (intf->altsetting[0].desc.bNumEndpoints < rc_ep + 1)
+		return -ENODEV;
+
 	purb = usb_alloc_urb(0, GFP_KERNEL);
 	if (purb == NULL)
 		return -ENOMEM;
-- 
2.12.0