null pointer dereference in exp
I was able to reproduce this issue on r2.14.

<img width="746" alt="image" src="https://github.com/tensorflow/tensorflow/assets/118897289/e1956661-acb0-463a-aa8c-36f6dc1f1d94">

@pkgoogle Could you please look into this issue?

Thanks. I was able to reproduce on nightly:

```
./benchmark_model --graph=exp.tflite
INFO: STARTING!
INFO: Log parameter values verbosely: [0]
INFO: Graph: [exp.tflite]
INFO: Loaded model exp.tflite
ERROR: Invalid tensor index 1025 in inputs. The subgraph has 3 tensors

INFO: Created TensorFlow Lite XNNPACK delegate for CPU.
Segmentation fault
```

@alankelly, can you please take a look. Thanks.
### Issue type

Bug

### Have you reproduced the bug with TensorFlow Nightly?

Yes

### Source

source

### TensorFlow version

tf 2.14.0

### Custom code

Yes

### OS platform and distribution

Ubuntu 18.04.6

### Mobile device

_No response_

### Python version

Python 3.8.3

### Bazel version

bazel 5.3.0

### GCC/compiler version

gcc 7.5.0

### CUDA/cuDNN version

_No response_

### GPU model and memory

_No response_

### Current behavior?

A maliciously constructed `exp` operator model leads to `op_context.input` being empty, causing a null pointer dereference in the `Prepare` function.
```c
// exp.cc
TfLiteStatus Prepare(TfLiteContext* context, TfLiteNode* node) {
  OpData* data = static_cast<OpData*>(node->user_data);
  TF_LITE_ENSURE_EQ(context, NumInputs(node), 1);
  TF_LITE_ENSURE_EQ(context, NumOutputs(node), 1);

  ExpContext op_context(context, node);
  const TfLiteTensor* input = op_context.input;
  TfLiteTensor* output = op_context.output;

  TfLiteIntArray* output_dims = TfLiteIntArrayCopy(input->dims);
  output->type = input->type;   // input is nullptr
```
[exp.zip](https://github.com/tensorflow/tensorflow/files/13037247/exp.zip)


### Standalone code to reproduce the issue

```shell
I use the benchmark tool built according to [this official guide](https://www.tensorflow.org/lite/guide/build_cmake#step_1_install_cmake_tool), as follows:
1. git clone https://github.com/tensorflow/tensorflow.git tensorflow_src
2. mkdir tflite_build && cd tflite_build
3. cmake ../tensorflow_src/tensorflow/lite
4. cmake --build . -j
5. cmake --build . -j -t benchmark_model

The benchmark is in the tools directory


When I use the benchmark tool for PoC validation, it causes the TensorFlow Lite inference process to be subjected to a DOS（coredump).
❯ ./benchmark_model --graph=../poc/exp.tflite
INFO: STARTING!
INFO: Log parameter values verbosely: [0]
INFO: Graph: [../poc/exp.tflite]
INFO: Loaded model ../poc/exp.tflite
ERROR: Invalid tensor index 1025 in inputs. The subgraph has 3 tensors

INFO: Created TensorFlow Lite XNNPACK delegate for CPU.
[1]    6687 segmentation fault (core dumped)  ./benchmark_model --graph=../poc/exp.tflite
```


### Relevant log output

_No response_