[PATCH 03/26] drm/gud: use array_size

[Julia Lawall]

Use array_size to protect against multiplication overflows.

The changes were done using the following Coccinelle semantic patch:

// <smpl>
@@
    expression E1, E2;
    constant C1, C2;
    identifier alloc = {vmalloc,vzalloc};
@@
    
(
      alloc(C1 * C2,...)
|
      alloc(
-           (E1) * (E2)
+           array_size(E1, E2)
      ,...)
)
// </smpl>

Signed-off-by: Julia Lawall <julia.law...@inria.fr>

---
 drivers/gpu/drm/gud/gud_pipe.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/gud/gud_pipe.c b/drivers/gpu/drm/gud/gud_pipe.c
index dc16a92625d4..34df847bd829 100644
--- a/drivers/gpu/drm/gud/gud_pipe.c
+++ b/drivers/gpu/drm/gud/gud_pipe.c
@@ -390,7 +390,7 @@ static int gud_fb_queue_damage(struct gud_device *gdrm, 
struct drm_framebuffer *
        mutex_lock(&gdrm->damage_lock);
 
        if (!gdrm->shadow_buf) {
-               gdrm->shadow_buf = vzalloc(fb->pitches[0] * fb->height);
+               gdrm->shadow_buf = vzalloc(array_size(fb->pitches[0], 
fb->height));
                if (!gdrm->shadow_buf) {
                        mutex_unlock(&gdrm->damage_lock);
                        return -ENOMEM;