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Message-Id: <20230623211457.102544-17-Julia.Lawall@inria.fr>
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);
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