linux-kernel - RE: [PATCH][next] drm/amdgpu: Fix sizeof() mismatch in bps_bo kmalloc

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Date:   Wed, 25 Nov 2020 15:10:03 +0000
From:   "Chen, Guchun" <Guchun.Chen@....com>
To:     Colin King <colin.king@...onical.com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "Zhou1, Tao" <Tao.Zhou1@....com>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
CC:     "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH][next] drm/amdgpu: Fix sizeof() mismatch in bps_bo
 kmalloc_array creation

[AMD Public Use]

Reviewed-by: Guchun Chen <guchun.chen@....com>

Regards,
Guchun

-----Original Message-----
From: Colin King <colin.king@...onical.com> 
Sent: Wednesday, November 25, 2020 10:18 PM
To: Deucher, Alexander <Alexander.Deucher@....com>; Koenig, Christian <Christian.Koenig@....com>; David Airlie <airlied@...ux.ie>; Daniel Vetter <daniel@...ll.ch>; Zhou1, Tao <Tao.Zhou1@....com>; Chen, Guchun <Guchun.Chen@....com>; amd-gfx@...ts.freedesktop.org; dri-devel@...ts.freedesktop.org
Cc: kernel-janitors@...r.kernel.org; linux-kernel@...r.kernel.org
Subject: [PATCH][next] drm/amdgpu: Fix sizeof() mismatch in bps_bo kmalloc_array creation

From: Colin Ian King <colin.king@...onical.com>

An incorrect sizeof() is being used, sizeof((*data)->bps_bo) is not correct, it should be sizeof(*(*data)->bps_bo).  It just so happens to work because the sizes are the same.  Fix it.

Addresses-Coverity: ("Sizeof not portable (SIZEOF_MISMATCH)")
Fixes: 5278a159cf35 ("drm/amdgpu: support reserve bad page for virt (v3)")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
index 2d51b7694d1f..df15d33e3c5c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -283,7 +283,7 @@ static int amdgpu_virt_init_ras_err_handler_data(struct amdgpu_device *adev)
 		return -ENOMEM;
 
 	bps = kmalloc_array(align_space, sizeof((*data)->bps), GFP_KERNEL);
-	bps_bo = kmalloc_array(align_space, sizeof((*data)->bps_bo), GFP_KERNEL);
+	bps_bo = kmalloc_array(align_space, sizeof(*(*data)->bps_bo), 
+GFP_KERNEL);
 
 	if (!bps || !bps_bo) {
 		kfree(bps);
--
2.29.2