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staging: xgifb: use display information in info not in var for panning 

We must not use any information in the passed var besides xoffset,
yoffset and vmode as otherwise applications might abuse it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Laurent Pinchart 2011-05-25 11:34:52 +02:00
parent 10a6c1de2c
commit 0d5c6ca30b
1 changed files with 6 additions and 16 deletions
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22
drivers/staging/xgifb/XGI_main_26.c
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@ -1364,26 +1364,16 @@ static int XGIfb_do_set_var(struct fb_var_screeninfo *var, int isactive,
}
#ifdef XGIFB_PAN
static int XGIfb_pan_var(struct fb_var_screeninfo *var)
static int XGIfb_pan_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
unsigned int base;
/* printk("Inside pan_var"); */
if (var->xoffset > (var->xres_virtual - var->xres)) {
/* printk("Pan: xo: %d xv %d xr %d\n",
var->xoffset, var->xres_virtual, var->xres); */
return -EINVAL;
}
if (var->yoffset > (var->yres_virtual - var->yres)) {
/* printk("Pan: yo: %d yv %d yr %d\n",
var->yoffset, var->yres_virtual, var->yres); */
return -EINVAL;
}
base = var->yoffset * var->xres_virtual + var->xoffset;
base = var->yoffset * info->var.xres_virtual + var->xoffset;
/* calculate base bpp dep. */
switch (var->bits_per_pixel) {
switch (info->var.bits_per_pixel) {
case 16:
base >>= 1;
break;
@ -1681,9 +1671,9 @@ static int XGIfb_pan_display(struct fb_var_screeninfo *var,
/* printk("\nInside pan_display:\n"); */
if (var->xoffset > (var->xres_virtual - var->xres))
if (var->xoffset > (info->var.xres_virtual - info->var.xres))
return -EINVAL;
if (var->yoffset > (var->yres_virtual - var->yres))
if (var->yoffset > (info->var.yres_virtual - info->var.yres))
return -EINVAL;
if (var->vmode & FB_VMODE_YWRAP) {
@ -1696,7 +1686,7 @@ static int XGIfb_pan_display(struct fb_var_screeninfo *var,
> info->var.yres_virtual)
return -EINVAL;
}
err = XGIfb_pan_var(var);
err = XGIfb_pan_var(var, info);
if (err < 0)
return err;