CVE-2020-15191: In Tensorflow before versions 2.2.1 and 2.3.1, if a user passes an invalid argument to `dlpack.to_dlpack` the expected v

TensorFlow versions before 2.2.1 and 2.3.1 have a bug where invalid arguments to `dlpack.to_dlpack` (a function that converts data between formats) cause the code to create null pointers (memory references that point to nothing) without properly checking for errors. This can lead to the program crashing or behaving unpredictably when it tries to use these invalid pointers.