CVE-2021-29544 — Improper Check for Unusual or Exceptional Conditions in Google Tensorflow

TensorFlow is an end-to-end open source platform for machine learning. An attacker can trigger a denial of service via a `CHECK`-fail in `tf.raw_ops.QuantizeAndDequantizeV4Grad`. This is because the implementation does not validate the rank of the `input_*` tensors. In turn, this results in the tensors being passes as they are to `QuantizeAndDequantizePerChannelGradientImpl`. However, the `vec` method, requires the rank to 1 and triggers a `CHECK` failure otherwise. The fix will be included in T…