Messages in this thread Patch in this message | | | Date | Wed, 23 Apr 2008 19:20:57 +0200 | From | Roel Kluin <> | Subject | [PATCH] vga16fb: test virtual screen range before subtraction on unsigned |
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dx and dy are u32's, so the test should occur before the subtraction
Signed-off-by: Roel Kluin <12o3l@tiscali.nl> --- diff --git a/drivers/video/vga16fb.c b/drivers/video/vga16fb.c index 9b3c592..9d27517 100644 --- a/drivers/video/vga16fb.c +++ b/drivers/video/vga16fb.c @@ -1087,12 +1087,15 @@ static void vga16fb_copyarea(struct fb_info *info, const struct fb_copyarea *are width = x2 - dx; height = y2 - dy; + if (sx + dx < old_dx || sy + dy < old_dy) + return; + /* update sx1,sy1 */ sx += (dx - old_dx); sy += (dy - old_dy); /* the source must be completely inside the virtual screen */ - if (sx < 0 || sy < 0 || (sx + width) > vxres || (sy + height) > vyres) + if (sx + width > vxres || sy + height > vyres) return; switch (info->fix.type) {
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