linux-kernel - [PATCH AUTOSEL 4.19 56/57] drm/amdgpu: fix integer overflow test in amdgpu_bo_list

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Date:   Sun,  4 Nov 2018 08:51:43 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Huang Rui <ray.huang@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 56/57] drm/amdgpu: fix integer overflow test in amdgpu_bo_list_create()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit ff30e9e8509cb877dc7cbc776b36c70f5bdd290f ]

We accidentally left out the size of the amdgpu_bo_list struct.  It
could lead to memory corruption on 32 bit systems.  You'd have to
pick the absolute maximum and set "num_entries == 59652323" then size
would wrap to 16 bytes.

Fixes: 920990cb080a ("drm/amdgpu: allocate the bo_list array after the list")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Huang Rui <ray.huang@....com>
Reviewed-by: Bas Nieuwenhuizen <basni@...omium.org>
Signed-off-by: Huang Rui <ray.huang@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
index d472a2c8399f..b80243d3972e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
@@ -67,7 +67,8 @@ int amdgpu_bo_list_create(struct amdgpu_device *adev, struct drm_file *filp,
 	unsigned i;
 	int r;
 
-	if (num_entries > SIZE_MAX / sizeof(struct amdgpu_bo_list_entry))
+	if (num_entries > (SIZE_MAX - sizeof(struct amdgpu_bo_list))
+				/ sizeof(struct amdgpu_bo_list_entry))
 		return -EINVAL;
 
 	size = sizeof(struct amdgpu_bo_list);
-- 
2.17.1