diff options
| author | Roel Kluin <12o3l@tiscali.nl> | 2008-07-23 21:31:18 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-24 10:47:37 -0700 |
| commit | 1c0face9d4024bf942096297937759bdf0e1aeac (patch) | |
| tree | 7476e3d9697d313eaf963840ff3d1a9342aa1626 /drivers/video/atafb.c | |
| parent | 091c82c01295719d47b89b38d24e41ad2066ead8 (diff) | |
| download | lwn-1c0face9d4024bf942096297937759bdf0e1aeac.tar.gz lwn-1c0face9d4024bf942096297937759bdf0e1aeac.zip | |
atafb: 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: Tim Schmielau <tim@physik3.uni-rostock.de>
Cc: Krzysztof Helt <krzysztof.h1@wp.pl>
Cc: Antonino Daplas <adaplas@pol.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/atafb.c')
| -rw-r--r-- | drivers/video/atafb.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/video/atafb.c b/drivers/video/atafb.c index fa55d356b535..77eb8b34fbfa 100644 --- a/drivers/video/atafb.c +++ b/drivers/video/atafb.c @@ -2593,13 +2593,16 @@ static void atafb_copyarea(struct fb_info *info, const struct fb_copyarea *area) 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)) { |