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drm/amdgpu: Fix possible null pointer dereference

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commit 256503071c upstream.

mem = bo->tbo.resource may be NULL in amdgpu_vm_bo_update.

Fixes: 1802537820 ("drm/ttm: stop allocating dummy resources during BO creation")
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Felix Kuehling 2023-10-31 13:30:00 -04:00 committed by Greg Kroah-Hartman
parent ed8fc80b19
commit f3385c9b8e
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
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@ -1099,8 +1099,8 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev, struct amdgpu_bo_va *bo_va,
bo = gem_to_amdgpu_bo(gobj);
}
mem = bo->tbo.resource;
if (mem->mem_type == TTM_PL_TT ||
mem->mem_type == AMDGPU_PL_PREEMPT)
if (mem && (mem->mem_type == TTM_PL_TT ||
mem->mem_type == AMDGPU_PL_PREEMPT))
pages_addr = bo->tbo.ttm->dma_address;
}