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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 <adaplas@pol.net>
Cc: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roel Kluin 2008-07-23 21:31:18 -07:00 committed by Linus Torvalds
parent 816664f887
commit 091c82c012
1 changed files with 5 additions and 2 deletions
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7
drivers/video/amifb.c
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@ -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)) {