[patch 18/43] V4L/DVB (10218): cx23885: Fix Oops for mixed install of analog and digital only cards

[Greg KH]

2.6.28-stable review patch.  If anyone has any objections, please let us know.

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

From: Andy Walls <awalls@xxxxxxxxx>

commit cd8f894eacf13996d920fdd2aef1afc55156b191 upstream.

Analog support for HVR-1250 has not been completed, but does exist for
the HVR-1800.

Since both cards use the same driver, it tries to create the analog
dev for both devices, which is not possible.

This causes a NULL error to show up in video_open and mpeg_open.

-Mark

Iterations through the cx23885_devlist must check for NULL
pointers as some supported devices only have DVB support at the moment.
Mark Jenks encoutered an Oops in a system with both an HVR-1250 and HVR-1800
installed.

-Andy

Reported-by: Mark Jenks <mjenks1968@xxxxxxxxx>
Tested-by: Mark Jenks <mjenks1968@xxxxxxxxx>
Signed-off-by: Mark Jenks <mjenks1968@xxxxxxxxx>
Signed-off-by: Andy Walls <awalls@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Signed-off-by: Jarod Wilson <jarod@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/media/video/cx23885/cx23885-417.c   |    3 ++-
 drivers/media/video/cx23885/cx23885-video.c |    5 +++--
 2 files changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/media/video/cx23885/cx23885-417.c
+++ b/drivers/media/video/cx23885/cx23885-417.c
@@ -1585,7 +1585,8 @@ static int mpeg_open(struct inode *inode
 	lock_kernel();
 	list_for_each(list, &cx23885_devlist) {
 		h = list_entry(list, struct cx23885_dev, devlist);
-		if (h->v4l_device->minor == minor) {
+		if (h->v4l_device &&
+		    h->v4l_device->minor == minor) {
 			dev = h;
 			break;
 		}
--- a/drivers/media/video/cx23885/cx23885-video.c
+++ b/drivers/media/video/cx23885/cx23885-video.c
@@ -730,12 +730,13 @@ static int video_open(struct inode *inod
 	lock_kernel();
 	list_for_each(list, &cx23885_devlist) {
 		h = list_entry(list, struct cx23885_dev, devlist);
-		if (h->video_dev->minor == minor) {
+		if (h->video_dev &&
+		    h->video_dev->minor == minor) {
 			dev  = h;
 			type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 		}
 		if (h->vbi_dev &&
-		   h->vbi_dev->minor == minor) {
+		    h->vbi_dev->minor == minor) {
 			dev  = h;
 			type = V4L2_BUF_TYPE_VBI_CAPTURE;
 		}


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