[PATCH 6/6] [media] gspca: konica: add missing endpoint sanity check

From: Johan Hovold
Date: Mon Mar 13 2017 - 08:55:19 EST

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: stable <stable@xxxxxxxxxxxxxxx> # 2.6.37
Cc: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
drivers/media/usb/gspca/konica.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/media/usb/gspca/konica.c b/drivers/media/usb/gspca/konica.c
index 71f273377f83..31b2117e8f1d 100644
--- a/drivers/media/usb/gspca/konica.c
+++ b/drivers/media/usb/gspca/konica.c
@@ -184,6 +184,9 @@ static int sd_start(struct gspca_dev *gspca_dev)
return -EIO;

+ if (alt->desc.bNumEndpoints < 2)
+ return -ENODEV;
packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize);

n = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].priv;