%outputs_83, %control_84 = tf_executor.island wraps "tf.EncodePng"(%outputs_81) {compression = -1 : i64, device = "/device:CPU:0"} : (tensor<*xui8>) -> tensor<*x!tf_type.string>

*   Fixes a heap buffer overflow caused by rounding
    ([CVE-2021-29529](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29529))
*   Fixes a `CHECK`-fail in `tf.raw_ops.EncodePng`
    ([CVE-2021-29531](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29531))
*   Fixes a heap out of bounds read in `RaggedCross`
    ([CVE-2021-29532](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29532))

    Res<TF_Tensor, [{A `Tensor` of type `T`.}]>:$output
  );

  TF_DerivedResultTypeAttr dtype = TF_DerivedResultTypeAttr<0>;

  let hasFolder = 1;
}

def TF_EncodePngOp : TF_Op<"EncodePng", [Pure]> {
  let summary = "PNG-encode an image.";

  let description = [{
`image` is a 3-D uint8 or uint16 Tensor of shape `[height, width, channels]`
where `channels` is:

*   1: for grayscale.