V4L/DVB (12338): cx18: Read buffer overflow

This mistakenly tested against sizeof(freqs) instead of the array size. Due to
the mask the only illegal value possible was 3.

Reported-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/media/video/cx18/cx18-controls.c b/drivers/media/video/cx18/cx18-controls.c
index 5136df198338..93f0dae01350 100644
--- a/drivers/media/video/cx18/cx18-controls.c
+++ b/drivers/media/video/cx18/cx18-controls.c
@@ -20,6 +20,7 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  *  02111-1307  USA
  */
+#include <linux/kernel.h>
 
 #include "cx18-driver.h"
 #include "cx18-cards.h"
@@ -317,7 +318,7 @@ int cx18_s_ext_ctrls(struct file *file, void *fh, struct v4l2_ext_controls *c)
                 idx = p.audio_properties & 0x03;
                 /* The audio clock of the digitizer must match the codec sample
                    rate otherwise you get some very strange effects. */
-                if (idx < sizeof(freqs))
+                if (idx < ARRAY_SIZE(freqs))
                         cx18_call_all(cx, audio, s_clock_freq, freqs[idx]);
                 return err;
         }