Potential NULL pointer deference in drm/amdgpu

[Yizhuo Zhai]

Hi All:
drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:
The function to_amdgpu_fence() could return NULL, but callers
in this file does not check the return value but directly dereference it,
which seems potentially unsafe.
Such callers include amdgpu_fence_get_timeline_name(),
amdgpu_fence_enable_signaling() and amdgpu_fence_free().


-- 
Kind Regards,

Yizhuo Zhai

Computer Science, Graduate Student
University of California, Riverside