[PATCH] bttv: fix missed index check

[Cyrill Gorcunov]

We should check for proper index first

Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxx>
---

I'm not really familiar with V4L so please check the patch

Index: linux-2.6.git/drivers/media/video/bt8xx/bttv-driver.c
===================================================================
--- linux-2.6.git.orig/drivers/media/video/bt8xx/bttv-driver.c	2008-03-21 18:04:39.000000000 +0300
+++ linux-2.6.git/drivers/media/video/bt8xx/bttv-driver.c	2008-04-01 21:29:53.000000000 +0400
@@ -3508,8 +3508,12 @@ static int radio_enum_input(struct file 
 static int radio_g_audio(struct file *file, void *priv,
 					struct v4l2_audio *a)
 {
+	if (a->index != 0)
+		return -EINVAL;
+
 	memset(a, 0, sizeof(*a));
 	strcpy(a->name, "Radio");
+
 	return 0;
 }
 
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