linux-kernel - [PATCH 16/26] drm/i915/gvt: use array

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Date:   Fri, 23 Jun 2023 23:14:47 +0200
From:   Julia Lawall <Julia.Lawall@...ia.fr>
To:     Zhenyu Wang <zhenyuw@...ux.intel.com>
Cc:     keescook@...omium.org, kernel-janitors@...r.kernel.org,
        Zhi Wang <zhi.a.wang@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 16/26] drm/i915/gvt: use array_size

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.Lawall@...ia.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);