linux-kernel - [PATCH 3.2 17/59] [media] gspca: konica: add missing endpoint sanity check

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Message-ID: <lsq.1503061993.743643177@decadent.org.uk>
Date:   Fri, 18 Aug 2017 14:13:13 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Johan Hovold" <johan@...nel.org>,
        "Hans Verkuil" <hansverk@...co.com>,
        "Hans de Goede" <hdegoede@...hat.com>,
        "Mauro Carvalho Chehab" <mchehab@...pensource.com>
Subject: [PATCH 3.2 17/59] [media] gspca: konica: add missing endpoint
 sanity check

3.2.92-rc1 review patch.  If anyone has any objections, please let me know.

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

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

commit aa58fedb8c7b6cf2f05941d238495f9e2f29655c upstream.

Make sure to check the number of endpoints to avoid accessing memory
beyond the endpoint array should a device lack the expected endpoints.

Note that, as far as I can tell, the gspca framework has already made
sure there is at least one endpoint in the current alternate setting so
there should be no risk for a NULL-pointer dereference here.

Fixes: b517af722860 ("V4L/DVB: gspca_konica: New gspca subdriver for
konica chipset using cams")

Cc: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Hans Verkuil <hansverk@...co.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/media/video/gspca/konica.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/media/video/gspca/konica.c
+++ b/drivers/media/video/gspca/konica.c
@@ -290,6 +290,9 @@ static int sd_start(struct gspca_dev *gs
 		return -EIO;
 	}
 
+	if (alt->desc.bNumEndpoints < 2)
+		return -ENODEV;
+
 	packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize);
 
 	reg_w(gspca_dev, sd->brightness, BRIGHTNESS_REG);