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drm/amdgpu: fix integer overflow test in amdgpu_bo_list_create() 

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: 920990cb08 ("drm/amdgpu: allocate the bo_list array after the list")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Bas Nieuwenhuizen <basni@chromium.org>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Dan Carpenter 2018-08-10 18:50:32 +08:00 committed by Alex Deucher
parent e51ee68ff2
commit ff30e9e850
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
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@ -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);