Re: Potential NULL pointer deference in drm/amdgpu

Hi Yizhuo,

Am 10.10.19 um 07:09 schrieb 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().

That is expected behavior and no need to worry.

The functions in amdgpu_fence.c are the callbacks to implement amdgpu_fence_ops. The function to_amdgpu_fence() checks if the ops of the fence are amdgpu_fence_ops, so it is guaranteed that the functions are called with an amdgpu_fence structure.

Regards, Christian.