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[media] ivtvfb: Add sanity check to ivtvfb_pan_display()

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Add sanity check to ivtvfb_pan_display() to ensure only valid values are used
to pan the display. Invalid values are rejected with -EINVAL

Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Ian Armstrong 2011-05-28 22:15:41 -03:00 committed by Mauro Carvalho Chehab
parent 5d9c08dea0
commit 6600cc301d
1 changed files with 4 additions and 0 deletions
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4
drivers/media/video/ivtv/ivtvfb.c
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@ -836,6 +836,10 @@ static int ivtvfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *inf
u32 osd_pan_index;
struct ivtv *itv = (struct ivtv *) info->par;
if (var->yoffset + info->var.yres > info->var.yres_virtual ||
var->xoffset + info->var.xres > info->var.xres_virtual)
return -EINVAL;
osd_pan_index = var->yoffset * info->fix.line_length
+ var->xoffset * info->var.bits_per_pixel / 8;
write_reg(osd_pan_index, 0x02A0C);