drm/amdgpu: don't leave dangling pointers around

Right now it's possible to trigger fence_drv.fences[] dereference after
the array has been freed. While the real problem is elsewhere, this still
results in confusing errors that depend on how the freed memory was
reused (I've seen "kernel tried to execute NX-protected page"), it's
better to clear them and get NULL dereference so that it's obvious what's
going wrong.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
index 0b109aebfec6..3a2e42f4b897 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -454,6 +454,7 @@ void amdgpu_fence_driver_fini(struct amdgpu_device *adev)
                 for (j = 0; j <= ring->fence_drv.num_fences_mask; ++j)
                         fence_put(ring->fence_drv.fences[j]);
                 kfree(ring->fence_drv.fences);
+                ring->fence_drv.fences = NULL;
                 ring->fence_drv.initialized = false;
         }
 }