releases/4.9.30/watchdog-pcwd_usb-fix-null-deref-at-probe.patch

   1 From 46c319b848268dab3f0e7c4a5b6e9146d3bca8a4 Mon Sep 17 00:00:00 2001
   2 From: Johan Hovold <johan@kernel.org>
   3 Date: Mon, 13 Mar 2017 13:49:45 +0100
   4 Subject: watchdog: pcwd_usb: fix NULL-deref at probe
   5
   6 From: Johan Hovold <johan@kernel.org>
   7
   8 commit 46c319b848268dab3f0e7c4a5b6e9146d3bca8a4 upstream.
   9
  10 Make sure to check the number of endpoints to avoid dereferencing a
  11 NULL-pointer should a malicious device lack endpoints.
  12
  13 Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
  14 Signed-off-by: Johan Hovold <johan@kernel.org>
  15 Reviewed-by: Guenter Roeck <linux@roeck-us.net>
  16 Signed-off-by: Guenter Roeck <linux@roeck-us.net>
  17 Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
  18 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  19
  20 ---
  21  drivers/watchdog/pcwd_usb.c |    3 +++
  22  1 file changed, 3 insertions(+)
  23
  24 --- a/drivers/watchdog/pcwd_usb.c
  25 +++ b/drivers/watchdog/pcwd_usb.c
  26 @@ -630,6 +630,9 @@ static int usb_pcwd_probe(struct usb_int
  27                 return -ENODEV;
  28         }
  29
  30 +       if (iface_desc->desc.bNumEndpoints < 1)
  31 +               return -ENODEV;
  32 +
  33         /* check out the endpoint: it has to be Interrupt & IN */
  34         endpoint = &iface_desc->endpoint[0].desc;
  35