V4L/DVB (9920): em28xx: fix NULL pointer dereference in call to VIDIOC_INT_RESET command

Fix a NULL pointer dereference that would occur if the video decoder tied to
the em28xx supports the VIDIOC_INT_RESET call (for example: the cx25840 driver)

Signed-off-by: Devin Heitmueller <dheitmueller@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index 610f535a257c..4ea1f1e04897 100644
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -549,10 +549,11 @@ static int em28xx_config(struct em28xx *dev)
 static void em28xx_config_i2c(struct em28xx *dev)
 {
         struct v4l2_routing route;
+        int zero = 0;
 
         route.input = INPUT(dev->ctl_input)->vmux;
         route.output = 0;
-        em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, NULL);
+        em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, &zero);
         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
         em28xx_i2c_call_clients(dev, VIDIOC_STREAMON, NULL);
 }