acornfb: 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/acornfb.c b/drivers/video/acornfb.c
index 3bacc1290548f21c7e2e7a084448feaaa5fd7bed..b303f17150654a8a4d0237f41977421a29cd715b 100644 (file)
--- a/drivers/video/acornfb.c
+++ b/drivers/video/acornfb.c
@@ -850,9 +850,9 @@ acornfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
        u_int y_bottom = var->yoffset;
 
        if (!(var->vmode & FB_VMODE_YWRAP))
-               y_bottom += var->yres;
+               y_bottom += info->var.yres;
 
-       if (y_bottom > var->yres_virtual)
+       if (y_bottom > info->var.yres_virtual)
                return -EINVAL;
 
        acornfb_update_dma(info, var);