Re: [PATCH] drm/ttm: Fix dma_fence refcnt leak in ttm_bo_vm_fault_reserved

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Am 13.06.20 um 14:28 schrieb Xiyu Yang:
ttm_bo_vm_fault_reserved() invokes dma_fence_get(), which returns a
reference of the specified dma_fence object to "moving" with increased
refcnt.

When ttm_bo_vm_fault_reserved() returns, local variable "moving" becomes
invalid, so the refcount should be decreased to keep refcount balanced.

The reference counting issue happens in several exception handling paths
of ttm_bo_vm_fault_reserved(). When those error scenarios occur such as
"err" equals to -EBUSY, the function forgets to decrease the refcnt
increased by dma_fence_get(), causing a refcnt leak.

Fix this issue by calling dma_fence_put() when no_wait_gpu flag is
equals to true.

Signed-off-by: Xiyu Yang <xiyuyang19@xxxxxxxxxxxx>
Signed-off-by: Xin Tan <tanxin.ctf@xxxxxxxxx>

Good catch, Reviewed-by: Christian König <christian.koenig@xxxxxxx>.

Going to pick that up for drm-misc-fixes.

Christian.

---
  drivers/gpu/drm/ttm/ttm_bo_vm.c | 2 ++
  1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index a43aa7275f12..fa03fab02076 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -300,8 +300,10 @@ vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
  			break;
  		case -EBUSY:
  		case -ERESTARTSYS:
+			dma_fence_put(moving);
  			return VM_FAULT_NOPAGE;
  		default:
+			dma_fence_put(moving);
  			return VM_FAULT_SIGBUS;
  		}

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