From 091c82c01295719d47b89b38d24e41ad2066ead8 Mon Sep 17 00:00:00 2001 From: Roel Kluin <12o3l@tiscali.nl> Date: Wed, 23 Jul 2008 21:31:18 -0700 Subject: [PATCH] amifb: test virtual screen range before subtraction on unsigned dx and dy are u32's, so the test should occur before the subtraction Signed-off-by: Roel Kluin <12o3l@tiscali.nl> Cc: Antonino Daplas Cc: Krzysztof Helt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/amifb.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/video/amifb.c b/drivers/video/amifb.c index 45c154ade9ca..0c549aa1cf87 100644 --- a/drivers/video/amifb.c +++ b/drivers/video/amifb.c @@ -2048,13 +2048,16 @@ static void amifb_copyarea(struct fb_info *info, width = x2 - dx; height = y2 - dy; + if (area->sx + dx < area->dx || area->sy + dy < area->dy) + return; + /* update sx,sy */ sx = area->sx + (dx - area->dx); sy = area->sy + (dy - area->dy); /* the source must be completely inside the virtual screen */ - if (sx < 0 || sy < 0 || (sx + width) > info->var.xres_virtual || - (sy + height) > info->var.yres_virtual) + if (sx + width > info->var.xres_virtual || + sy + height > info->var.yres_virtual) return; if (dy > sy || (dy == sy && dx > sx)) { -- 2.20.1