CVE-2021-29616 Null dereference in Grappler's `TrySimplify`

TensorFlow is an end-to-end open source platform for machine learning. The implementation of TrySimplifyhttps://github.com/tensorflow/tensorflow/blob/c22d88d6ff33031aa113e48aa3fc9aa74ed79595/tensorflow/core/grappler/optimizers/arithmeticoptimizer.ccL390-L401 has undefined behavior due to...