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

(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@hauppauge.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/media/video/cx88/cx88-mpeg.c b/drivers/media/video/cx88/cx88-mpeg.c
index 543b05ebc0e79ba74851f2a7c4b4180bde2d1e93..c36e2b7172e9a42ca3130b1caa0357eee004b089 100644 (file)
--- a/drivers/media/video/cx88/cx88-mpeg.c
+++ b/drivers/media/video/cx88/cx88-mpeg.c
@@ -580,7 +580,7 @@ struct cx8802_dev * cx8802_get_device(struct inode *inode)
 
        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;
        }