[media] cx23885: Fix some smatch warnings

Make sure that it won't go past the config buffers

	drivers/media/pci/cx23885/cx23885-dvb.c:1733 dvb_register() warn: buffer overflow 'netup_xc5000_config' 2 <= s32max
	drivers/media/pci/cx23885/cx23885-dvb.c:1745 dvb_register() warn: buffer overflow 'netup_stv0367_config' 2 <= s32max
	drivers/media/pci/cx23885/cx23885-dvb.c:1752 dvb_register() warn: buffer overflow 'netup_xc5000_config' 2 <= s32max

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

2 files changed, 4 insertions, 1 deletions

diff --git a/drivers/media/pci/cx23885/cx23885-dvb.c b/drivers/media/pci/cx23885/cx23885-dvb.c
index 828b54afd59e..818f3c2fc98d 100644
--- a/drivers/media/pci/cx23885/cx23885-dvb.c
+++ b/drivers/media/pci/cx23885/cx23885-dvb.c
@@ -1720,6 +1720,9 @@ static int dvb_register(struct cx23885_tsport *port)
                 }
                 break;
         case CX23885_BOARD_NETUP_DUAL_DVB_T_C_CI_RF:
+                if (port->nr > 2)
+                        return 0;
+
                 i2c_bus = &dev->i2c_bus[0];
                 mfe_shared = 1;/* MFE */
                 port->frontends.gate = 0;/* not clear for me yet */
diff --git a/drivers/media/pci/cx23885/cx23885.h b/drivers/media/pci/cx23885/cx23885.h
index 2ebece93d111..a6735afe2269 100644
--- a/drivers/media/pci/cx23885/cx23885.h
+++ b/drivers/media/pci/cx23885/cx23885.h
@@ -257,7 +257,7 @@ struct cx23885_dmaqueue {
 struct cx23885_tsport {
         struct cx23885_dev *dev;
 
-        int                        nr;
+        unsigned                   nr;
         int                        sram_chno;
 
         struct vb2_dvb_frontends   frontends;