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authorJesse Zhang <jesse.zhang@amd.com>2024-05-23 17:14:45 +0800
committerAlex Deucher <alexander.deucher@amd.com>2024-05-29 17:03:20 -0400
commita0cf36546cc24ae1c95d72253c7795d4d2fc77aa (patch)
tree6184a3b7cb76b0860e98d12b5ff2c78670eea1e3 /drivers/gpu
parent05d9e24ddb15160164ba6e917a88c00907dc2434 (diff)
drm/amdgpu: fix dereference null return value for the function amdgpu_vm_pt_parent
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>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c
index 7fdd306a48a0..f07647a9a9d9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c
@@ -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;