gxt4500: 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>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/drivers/video/gxt4500.c b/drivers/video/gxt4500.c
index 896e53d..0fad23f 100644 (file)
--- a/drivers/video/gxt4500.c
+++ b/drivers/video/gxt4500.c
@@ -543,8 +543,8 @@ static int gxt4500_pan_display(struct fb_var_screeninfo *var,
 
        if (var->xoffset & 7)
                return -EINVAL;
-       if (var->xoffset + var->xres > var->xres_virtual ||
-           var->yoffset + var->yres > var->yres_virtual)
+       if (var->xoffset + info->var.xres > info->var.xres_virtual ||
+           var->yoffset + info->var.yres > info->var.yres_virtual)
                return -EINVAL;
 
        writereg(par, REFRESH_START, (var->xoffset << 16) | var->yoffset);