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V4L/DVB (10558): bttv: norm value should be unsigned

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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.

Reported-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Trent Piepho 2009-01-28 21:32:58 -03:00 committed by Mauro Carvalho Chehab
parent 1d6af821a9
commit 4ef2ccc261
5 changed files with 13 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/media/video/bt8xx/bttv-cards.c
View File

@ -4085,7 +4085,7 @@ 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) {

13
drivers/media/video/bt8xx/bttv-driver.c
View File

@ -1277,7 +1277,7 @@ 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);
@ -1290,16 +1290,13 @@ 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 */

2
drivers/media/video/bt8xx/bttv-vbi.c
View File

@ -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;

2
drivers/media/video/bt8xx/bttv.h
View File

@ -265,7 +265,7 @@ 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);

9
drivers/media/video/bt8xx/bttvp.h
View File

@ -135,7 +135,7 @@ struct bttv_buffer {
/* bttv specific */
const struct bttv_format *fmt;
int tvnorm;
unsigned int tvnorm;
int btformat;
int btswap;
struct bttv_geometry geo;
@ -154,7 +154,7 @@ struct bttv_buffer_set {
};
struct bttv_overlay {
int tvnorm;
unsigned int tvnorm;
struct v4l2_rect w;
enum v4l2_field field;
struct v4l2_clip *clips;
@ -174,7 +174,7 @@ 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. */
@ -378,7 +378,8 @@ 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;