The process of building the control flow graph for a TensorFlow model is vulnerable to a null pointer exception when nodes that should be paired are not:
import tensorflow as tf
@tf.function
def func():
return tf.raw_ops.Exit(data=[False,False])
func()
This occurs because the code assumes that the first node in the pairing (e.g., an Enter
node) always exists when encountering the second node (e.g., an Exit
node):
...
} else if (IsExit(curr_node)) {
// Exit to the parent frame.
parent = parent_nodes[curr_id];
frame_name = cf_info->frame_names[parent->id()];
...
When this is not the case, parent
is nullptr
so dereferencing it causes a crash.
We have patched the issue in GitHub commit 05cbebd3c6bb8f517a158b0155debb8df79017ff.
The fix will be included in TensorFlow 2.7.0. We will also cherrypick this commit on TensorFlow 2.6.1, TensorFlow 2.5.2, and TensorFlow 2.4.4, as these are also affected and still in supported range.
Please consult our security guide for more information regarding the security model and how to contact us with issues and questions.
This vulnerability has been reported by members of the Aivul Team from Qihoo 360.
{ "nvd_published_at": "2021-11-05T21:15:00Z", "cwe_ids": [ "CWE-476" ], "severity": "MODERATE", "github_reviewed": true, "github_reviewed_at": "2021-11-08T22:12:27Z" }