From 7c8c6f113e1169690dbfbfc486360d10452e5a85 Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Wed, 7 Sep 2016 16:57:59 +0100
Subject: [PATCH] fbmem: Ensure that parameters are properly checked within
 fb_copyarea_user

---
 drivers/video/fbdev/core/fbmem.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1090,7 +1090,13 @@ static int fb_copyarea_user(struct fb_in
 	int ret = 0;
 	if (!lock_fb_info(info))
 		return -ENODEV;
-	if (copy->dx + copy->width > info->var.xres ||
+	if (copy->dx >= info->var.xres ||
+	    copy->sx >= info->var.xres ||
+	    copy->width > info->var.xres ||
+	    copy->dy >= info->var.yres ||
+	    copy->sy >= info->var.yres ||
+	    copy->height > info->var.yres ||
+	    copy->dx + copy->width > info->var.xres ||
 	    copy->sx + copy->width > info->var.xres ||
 	    copy->dy + copy->height > info->var.yres ||
 	    copy->sy + copy->height > info->var.yres) {
