target/linux/brcm2708/patches-4.14/950-0127-panel-raspberrypi-touchscreen-Fix-NULL-deref-if-prob.patch

   1 From d68d26f7f526fce52e71312501f3d07044a3c996 Mon Sep 17 00:00:00 2001
   2 From: Eric Anholt <eric@anholt.net>
   3 Date: Wed, 12 Apr 2017 17:52:56 -0700
   4 Subject: [PATCH 127/454] panel-raspberrypi-touchscreen: Fix NULL deref if
   5  probe order goes wrong.
   6
   7 If the i2c driver hadn't pobed before the panel driver probes, then
   8 the client would be NULL but we were looking for an ERR_PTR in the
   9 error case.
  10
  11 Signed-off-by: Eric Anholt <eric@anholt.net>
  12 ---
  13  drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c | 3 +++
  14  1 file changed, 3 insertions(+)
  15
  16 --- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
  17 +++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
  18 @@ -399,6 +399,9 @@ static struct i2c_client *rpi_touchscree
  19
  20         of_node_put(node);
  21
  22 +       if (!client)
  23 +               return ERR_PTR(-EPROBE_DEFER);
  24 +
  25         return client;
  26  }
  27