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

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>

diff --git a/drivers/media/video/ivtv/ivtvfb.c b/drivers/media/video/ivtv/ivtvfb.c
index 2d5a974..5dec2e4 100644 (file)
--- a/drivers/media/video/ivtv/ivtvfb.c
+++ b/drivers/media/video/ivtv/ivtvfb.c
@@ -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);