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authorRoel Kluin <12o3l@tiscali.nl>2008-07-23 21:31:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:37 -0700
commit77a6e7abb09de0e85a15e2fe42c21ffc59847759 (patch)
tree94ddd7718d173edcd406457d0bef7d9dea79c0f9 /drivers
parent1c0face9d4024bf942096297937759bdf0e1aeac (diff)
vga16fb: 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> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/video/vga16fb.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/video/vga16fb.c b/drivers/video/vga16fb.c
index 9b3c5923365..9d275171789 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) {