[PATCH AUTOSEL 5.15 56/68] drm/amdgpu: Fix double free of dmabuf

Sasha Levin
2021-11-30T14:54:03Z

From: xinhui pan <xinhui.pan@amd.com>

[ Upstream commit 4eb6bb649fe041472ddd00f94870c0b86ef49d34 ]

amdgpu_amdkfd_gpuvm_free_memory_of_gpu drop dmabuf reference increased in
amdgpu_gem_prime_export.
amdgpu_bo_destroy drop dmabuf reference increased in
amdgpu_gem_prime_import.

So remove this extra dma_buf_put to avoid double free.

Signed-off-by: xinhui pan <xinhui.pan@amd.com>
Tested-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 6 ------
1 file changed, 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index cdf46bd0d8d5b..3862470c7f1eb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -644,12 +644,6 @@ kfd_mem_attach_dmabuf(struct amdgpu_device *adev, struct kgd_mem *mem,
if (IS_ERR(gobj))
return PTR_ERR(gobj);

- /* Import takes an extra reference on the dmabuf. Drop it now to
- * avoid leaking it. We only need the one reference in
- * kgd_mem->dmabuf.
- */
- dma_buf_put(mem->dmabuf);
-
*bo = gem_to_amdgpu_bo(gobj);
(*bo)->flags |= AMDGPU_GEM_CREATE_PREEMPTIBLE;
(*bo)->parent = amdgpu_bo_ref(mem->bo);
--
2.33.0