chore: import upstream snapshot with attribution

tensorflow/security/advisory/tfsa-2020-024.md

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+## TFSA-2020-024: Memory leak in `dlpack.to_dlpack`
+
+### CVE Number
+CVE-2020-15192
+
+### Impact
+If a user passes a list of strings to `dlpack.to_dlpack` there is a memory leak
+following an expected [validation failure](https://github.com/tensorflow/tensorflow/blob/0e68f4d3295eb0281a517c3662f6698992b7b2cf/tensorflow/c/eager/dlpack.cc#L100-L104):
+```cc
+      status->status = tensorflow::errors::InvalidArgument(
+          DataType_Name(static_cast<DataType>(data_type)),
+          " is not supported by dlpack");
+```
+
+The allocated memory is
+[from](https://github.com/tensorflow/tensorflow/blob/0e68f4d3295eb0281a517c3662f6698992b7b2cf/tensorflow/c/eager/dlpack.cc#L256):
+```cc
+  auto* tf_dlm_tensor_ctx = new TfDlManagedTensorCtx(tensor_ref);
+```
+
+The issue occurs because the `status` argument during validation failures [is not
+properly checked](https://github.com/tensorflow/tensorflow/blob/0e68f4d3295eb0281a517c3662f6698992b7b2cf/tensorflow/c/eager/dlpack.cc#L265-L267):
+```cc
+  dlm_tensor->dl_tensor.data = TFE_TensorHandleDevicePointer(h, status);
+  dlm_tensor->dl_tensor.dtype = GetDlDataType(data_type, status);
+```
+
+Since each of the above methods can return an error status, the `status` value
+must be checked before continuing.
+
+### Vulnerable Versions
+TensorFlow 2.2.0, 2.3.0.
+
+### Patches
+We have patched the issue in
+[22e07fb204386768e5bcbea563641ea11f96ceb8](https://github.com/tensorflow/tensorflow/commit/22e07fb204386768e5bcbea563641ea11f96ceb8)
+and will release a patch release for all affected versions.
+
+We recommend users to upgrade to TensorFlow 2.2.1 or 2.3.1.
+
+### For more information
+Please consult [our security
+guide](https://github.com/tensorflow/tensorflow/blob/master/SECURITY.md) for
+more information regarding the security model and how to contact us with issues
+and questions.
+
+### Attribution
+This vulnerability has been discovered through a variant analysis of [a
+vulnerability reported by members of the Aivul Team from Qihoo
+360](https://github.com/tensorflow/tensorflow/blob/master/tensorflow/security/advisory/tfsa-2020-023.md).