[PATCH AUTOSEL 6.9 20/23] drm/amdgpu: fix dereference null return value for the function amdgpu_vm_pt_parent

[Sasha Levin]

From: Jesse Zhang <jesse.zh...@amd.com>

[ Upstream commit a0cf36546cc24ae1c95d72253c7795d4d2fc77aa ]

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.zh...@amd.com>
Suggested-by: Christian König <christian.koe...@amd.com>
Reviewed-by: Christian König <christian.koe...@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c | 6 +++++-
 1 file changed, 5 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 124389a6bf481..512b42225003f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c
@@ -682,11 +682,15 @@ 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;
 
-- 
2.43.0