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SubjectPatch to DECODER_SET_NORM invocations
Date
Hi,

In the recent 2.2.x I discovered that saa7xxx driver expects norm
to be an int, while struct video_channel defines it as __u16.
This bombs if video_channel has something dirty next to it
on the stack.

Only one file is touched by the patch: drivers/char/buz.c, but
some more code is related. The unofficial patch for capture on
Netwinder (drivers/char/video-cyberpro.c) is broken. The bttv.c
is not affected (it has on-chip decoder instead of saa7xxx).
Pauline's Zoran patch is not affected (is uses int).

I am expiriencing difficulties identifying the maintainer of the code.
Alan, would you look at it please?

Greetings,
--Pete

diff -ur linux-2.2.18-pre19/drivers/char/buz.c linux-2.2.18-pre19-p3/drivers/char/buz.c
--- linux-2.2.18-pre19/drivers/char/buz.c Wed May 3 17:16:33 2000
+++ linux-2.2.18-pre19-p3/drivers/char/buz.c Tue Nov 7 08:43:58 2000
@@ -2389,7 +2389,7 @@
case VIDIOCSCHAN:
{
struct video_channel v;
- int input;
+ int input, norm;
int on, res;

if (copy_from_user(&v, arg, sizeof(v))) {
@@ -2421,9 +2421,10 @@
if (on)
zr36057_overlay(zr, 0);

+ norm = zr->params.norm;
i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_INPUT, &input);
- i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_NORM, &zr->params.norm);
- i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEOENCODER, ENCODER_SET_NORM, &zr->params.norm);
+ i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_NORM, &norm);
+ i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEOENCODER, ENCODER_SET_NORM, &norm);

if (on)
zr36057_overlay(zr, 1);
@@ -2781,7 +2782,7 @@
case BUZIOC_S_PARAMS:
{
struct zoran_params bp;
- int input, on;
+ int input, on, norm;

if (zr->codec_mode != BUZ_MODE_IDLE) {
return -EINVAL;
@@ -2808,9 +2809,10 @@
zr36057_overlay(zr, 0);

input = zr->params.input == 0 ? 3 : 7;
+ norm = zr->params.norm;
i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_INPUT, &input);
- i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_NORM, &zr->params.norm);
- i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEOENCODER, ENCODER_SET_NORM, &zr->params.norm);
+ i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_NORM, &norm);
+ i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEOENCODER, ENCODER_SET_NORM, &norm);

if (on)
zr36057_overlay(zr, 1);
@@ -2939,8 +2941,9 @@

/* restore previous input and norm */
input = zr->params.input == 0 ? 3 : 7;
+ norm = zr->params.norm;
i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_INPUT, &input);
- i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_NORM, &zr->params.norm);
+ i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_NORM, &norm);

if (copy_to_user(arg, &bs, sizeof(bs))) {
return -EFAULT;
@@ -3252,8 +3255,9 @@

j = zr->params.input == 0 ? 3 : 7;
i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_INPUT, &j);
- i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_NORM, &zr->params.norm);
- i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEOENCODER, ENCODER_SET_NORM, &zr->params.norm);
+ j = zr->params.norm;
+ i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_NORM, &j);
+ i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEOENCODER, ENCODER_SET_NORM, &j);

/* set individual interrupt enables (without GIRQ0)
but don't global enable until zoran_open() */

-
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