[2.6.20.21 review 21/35] V4L: cx88: Avoid a NULL pointer dereference during mpeg_open()

[Willy Tarreau]

(cherry picked from commit 48200baeab95fd39a7f4c4f3536c7142a64ac335)

[PATCH] V4L: cx88: Avoid a NULL pointer dereference during mpeg_open()

Bug: With a hardware encoder board installed as cx88[1] and a
non-encoder boards installed as cx88[0], an OOPS is generated
during cx8802_get_device() called from mpeg_open().

Signed-off-by: Steven Toth <stoth@xxxxxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxx>
Signed-off-by: Michael Krufky <mkrufky@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 drivers/media/video/cx88/cx88-mpeg.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

Index: 2.6/drivers/media/video/cx88/cx88-mpeg.c
===================================================================
--- 2.6.orig/drivers/media/video/cx88/cx88-mpeg.c
+++ 2.6/drivers/media/video/cx88/cx88-mpeg.c
@@ -556,7 +556,7 @@ struct cx8802_dev * cx8802_get_device(st
 
 	list_for_each(list,&cx8802_devlist) {
 		h = list_entry(list, struct cx8802_dev, devlist);
-		if (h->mpeg_dev->minor == minor)
+		if (h->mpeg_dev && h->mpeg_dev->minor == minor)
 			return h;
 	}
 

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