The pointer parent may be NULLed by the function amdgpu_vm_pt_parent.
To make the code more robust, check the pointer parent.
V2: When parent is NULL here we should
probably call BUG() instead. (Christian)
Signed-off-by: Jesse Zhang <Jesse.Zhang@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c
index 0763382d305a..6fac8440012e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c
@@ -706,11 +706,17 @@ 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 (!parent) {
+ BUG();
+ return -EINVAL;
+ }
+ bo = parent->bo;
+
for (level = 0, pbo = bo->parent; pbo; ++level)
pbo = pbo->parent;
--
2.25.1
