[Intel-gfx] [PATCH 16/26] drm/i915/gvt: 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/i915/gvt/gtt.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index 4ec85308379a..df52385ad436 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -1969,14 +1969,16 @@ static struct intel_vgpu_mm 
*intel_vgpu_create_ggtt_mm(struct intel_vgpu *vgpu)
                return ERR_PTR(-ENOMEM);
        }
 
-       mm->ggtt_mm.host_ggtt_aperture = vzalloc((vgpu_aperture_sz(vgpu) >> 
PAGE_SHIFT) * sizeof(u64));
+       mm->ggtt_mm.host_ggtt_aperture =
+               vzalloc(array_size(vgpu_aperture_sz(vgpu) >> PAGE_SHIFT, 
sizeof(u64)));
        if (!mm->ggtt_mm.host_ggtt_aperture) {
                vfree(mm->ggtt_mm.virtual_ggtt);
                vgpu_free_mm(mm);
                return ERR_PTR(-ENOMEM);
        }
 
-       mm->ggtt_mm.host_ggtt_hidden = vzalloc((vgpu_hidden_sz(vgpu) >> 
PAGE_SHIFT) * sizeof(u64));
+       mm->ggtt_mm.host_ggtt_hidden =
+               vzalloc(array_size(vgpu_hidden_sz(vgpu) >> PAGE_SHIFT, 
sizeof(u64)));
        if (!mm->ggtt_mm.host_ggtt_hidden) {
                vfree(mm->ggtt_mm.host_ggtt_aperture);
                vfree(mm->ggtt_mm.virtual_ggtt);