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drm/amdgpu: fix dereference null return value for the function amdgpu_vm_pt_parent

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The pointer parent may be NULLed by the function amdgpu_vm_pt_parent.
To make the code more robust, check the pointer parent.

Signed-off-by: Jesse Zhang <Jesse.Zhang@amd.com>
Suggested-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jesse Zhang 2024-05-23 17:14:45 +08:00 committed by Alex Deucher
parent 05d9e24ddb
commit a0cf36546c
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c
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@ -706,11 +706,15 @@ int amdgpu_vm_pde_update(struct amdgpu_vm_update_params *params,
struct amdgpu_vm_bo_base *entry)
{
struct amdgpu_vm_bo_base *parent = amdgpu_vm_pt_parent(entry);
struct amdgpu_bo *bo = parent->bo, *pbo;
struct amdgpu_bo *bo, *pbo;
struct amdgpu_vm *vm = params->vm;
uint64_t pde, pt, flags;
unsigned int level;
if (WARN_ON(!parent))
return -EINVAL;
bo = parent->bo;
for (level = 0, pbo = bo->parent; pbo; ++level)
pbo = pbo->parent;