V4L/DVB (7325): cx88-dvb: fix an OOPS for xc3028 devices, when dvb_attach fails

If dvb_attach fails, dev->dvb.frontend is NULL. This will produce an OOPS, as
reported.

Thanks to Vanessa Ezekowitz <vanessaezekowitz@gmail.com>

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

diff --git a/drivers/media/video/cx88/cx88-dvb.c b/drivers/media/video/cx88/cx88-dvb.c
index cf6b9b05f49678c734822134eefc2893f8197d2c..d72b817bf886ab13b8f74e00fb67dfca5586562f 100644 (file)
--- a/drivers/media/video/cx88/cx88-dvb.c
+++ b/drivers/media/video/cx88/cx88-dvb.c
@@ -461,6 +461,13 @@ static int attach_xc3028(u8 addr, struct cx8802_dev *dev)
                .video_dev = dev->core,
        };
 
+       if (!dev->dvb.frontend) {
+               printk(KERN_ERR "%s/2: dvb frontend not attached. "
+                               "Can't attach xc3028\n",
+                      dev->core->name);
+               return -EINVAL;
+       }
+
        fe = dvb_attach(xc2028_attach, dev->dvb.frontend, &cfg);
        if (!fe) {
                printk(KERN_ERR "%s/2: xc3028 attach failed\n",