bttv: norm value should be unsigned

From: Trent Piepho <xyzzy@speakeasy.org>

The norm value in the driver is an index into an array and the the driver
doesn't allow it to be negative or otherwise invalid.  It should be
unsigned but wasn't in all places.

Fix some structs and functions to have the norm be unsigned.  Get rid of
useless checks for "< 0".  Most of the driver code can't handle a norm
value that's out of range, so change some ">= BTTV_TVNORMS" checks to
BUG_ON().  There's no point in silently ignoring invalid driver state just
to crash because of it later.

Priority: normal

Reported-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>

5 files changed, 13 insertions, 15 deletions

diff --git a/linux/drivers/media/video/bt8xx/bttv-cards.c b/linux/drivers/media/video/bt8xx/bttv-cards.c
index e0bfbbc74..9dd7add53 100644
--- a/linux/drivers/media/video/bt8xx/bttv-cards.c
+++ b/linux/drivers/media/video/bt8xx/bttv-cards.c
@@ -4131,7 +4131,7 @@ static void __devinit avermedia_eeprom(struct bttv *btv)
 }
 
 /* used on Voodoo TV/FM (Voodoo 200), S0 wired to 0x10000 */
-void bttv_tda9880_setnorm(struct bttv *btv, int norm)
+void bttv_tda9880_setnorm(struct bttv *btv, unsigned int norm)
 {
 	/* fix up our card entry */
 	if(norm==V4L2_STD_NTSC) {
diff --git a/linux/drivers/media/video/bt8xx/bttv-driver.c b/linux/drivers/media/video/bt8xx/bttv-driver.c
index c02c0ec80..41cf151d8 100644
--- a/linux/drivers/media/video/bt8xx/bttv-driver.c
+++ b/linux/drivers/media/video/bt8xx/bttv-driver.c
@@ -1300,7 +1300,7 @@ bttv_crop_calc_limits(struct bttv_crop *c)
 }
 
 static void
-bttv_crop_reset(struct bttv_crop *c, int norm)
+bttv_crop_reset(struct bttv_crop *c, unsigned int norm)
 {
 	c->rect = bttv_tvnorms[norm].cropcap.defrect;
 	bttv_crop_calc_limits(c);
@@ -1313,16 +1313,13 @@ set_tvnorm(struct bttv *btv, unsigned int norm)
 	const struct bttv_tvnorm *tvnorm;
 	v4l2_std_id id;
 
-	if (norm < 0 || norm >= BTTV_TVNORMS)
-		return -EINVAL;
+	BUG_ON(norm >= BTTV_TVNORMS);
+	BUG_ON(btv->tvnorm >= BTTV_TVNORMS);
 
 	tvnorm = &bttv_tvnorms[norm];
 
-	if (btv->tvnorm < 0 ||
-	    btv->tvnorm >= BTTV_TVNORMS ||
-	    0 != memcmp(&bttv_tvnorms[btv->tvnorm].cropcap,
-			&tvnorm->cropcap,
-			sizeof (tvnorm->cropcap))) {
+	if (!memcmp(&bttv_tvnorms[btv->tvnorm].cropcap, &tvnorm->cropcap,
+		    sizeof (tvnorm->cropcap))) {
 		bttv_crop_reset(&btv->crop[0], norm);
 		btv->crop[1] = btv->crop[0]; /* current = default */
 
diff --git a/linux/drivers/media/video/bt8xx/bttv-vbi.c b/linux/drivers/media/video/bt8xx/bttv-vbi.c
index 6819e21a3..e79a402fa 100644
--- a/linux/drivers/media/video/bt8xx/bttv-vbi.c
+++ b/linux/drivers/media/video/bt8xx/bttv-vbi.c
@@ -411,7 +411,7 @@ int bttv_g_fmt_vbi_cap(struct file *file, void *f, struct v4l2_format *frt)
 	return 0;
 }
 
-void bttv_vbi_fmt_reset(struct bttv_vbi_fmt *f, int norm)
+void bttv_vbi_fmt_reset(struct bttv_vbi_fmt *f, unsigned int norm)
 {
 	const struct bttv_tvnorm *tvnorm;
 	unsigned int real_samples_per_line;
diff --git a/linux/drivers/media/video/bt8xx/bttv.h b/linux/drivers/media/video/bt8xx/bttv.h
index 0c07dc9b7..d8b41ae24 100644
--- a/linux/drivers/media/video/bt8xx/bttv.h
+++ b/linux/drivers/media/video/bt8xx/bttv.h
@@ -266,7 +266,7 @@ extern void bttv_init_card2(struct bttv *btv);
 
 /* card-specific funtions */
 extern void tea5757_set_freq(struct bttv *btv, unsigned short freq);
-extern void bttv_tda9880_setnorm(struct bttv *btv, int norm);
+extern void bttv_tda9880_setnorm(struct bttv *btv, unsigned int norm);
 
 /* extra tweaks for some chipsets */
 extern void bttv_check_chipset(void);
diff --git a/linux/drivers/media/video/bt8xx/bttvp.h b/linux/drivers/media/video/bt8xx/bttvp.h
index 92961e130..71289d832 100644
--- a/linux/drivers/media/video/bt8xx/bttvp.h
+++ b/linux/drivers/media/video/bt8xx/bttvp.h
@@ -137,7 +137,7 @@ struct bttv_buffer {
 
 	/* bttv specific */
 	const struct bttv_format   *fmt;
-	int                        tvnorm;
+	unsigned int               tvnorm;
 	int                        btformat;
 	int                        btswap;
 	struct bttv_geometry       geo;
@@ -156,7 +156,7 @@ struct bttv_buffer_set {
 };
 
 struct bttv_overlay {
-	int                    tvnorm;
+	unsigned int           tvnorm;
 	struct v4l2_rect       w;
 	enum v4l2_field        field;
 	struct v4l2_clip       *clips;
@@ -176,7 +176,7 @@ struct bttv_vbi_fmt {
 };
 
 /* bttv-vbi.c */
-void bttv_vbi_fmt_reset(struct bttv_vbi_fmt *f, int norm);
+void bttv_vbi_fmt_reset(struct bttv_vbi_fmt *f, unsigned int norm);
 
 struct bttv_crop {
 	/* A cropping rectangle in struct bttv_tvnorm.cropcap units. */
@@ -380,7 +380,8 @@ struct bttv {
 	unsigned int audio;
 	unsigned int mute;
 	unsigned long freq;
-	int tvnorm,hue,contrast,bright,saturation;
+	unsigned int tvnorm;
+	int hue, contrast, bright, saturation;
 	struct v4l2_framebuffer fbuf;
 	unsigned int field_count;