intelfb: 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>

diff --git a/drivers/video/intelfb/intelfbhw.c b/drivers/video/intelfb/intelfbhw.c
index 38065cf94ac4cf5dbaf195233871712af4607ab6..fbad61da359f796b579ae74b1dc01a78d888d4a9 100644 (file)
--- a/drivers/video/intelfb/intelfbhw.c
+++ b/drivers/video/intelfb/intelfbhw.c
@@ -390,12 +390,12 @@ int intelfbhw_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
        xoffset = ROUND_DOWN_TO(var->xoffset, 8);
        yoffset = var->yoffset;
 
-       if ((xoffset + var->xres > var->xres_virtual) ||
-           (yoffset + var->yres > var->yres_virtual))
+       if ((xoffset + info->var.xres > info->var.xres_virtual) ||
+           (yoffset + info->var.yres > info->var.yres_virtual))
                return -EINVAL;
 
        offset = (yoffset * dinfo->pitch) +
-                (xoffset * var->bits_per_pixel) / 8;
+                (xoffset * info->var.bits_per_pixel) / 8;
 
        offset += dinfo->fb.offset << 12;