NDO: Fix pull pointer write (#332)

Fixes the following issue detected by OSS-Fuzz:

* https://issues.oss-fuzz.com/issues/386860187

This fix was generated by CodeRover-S, an LLM agent for fixing security vulnerabilities. More details can be found at:

* https://arxiv.org/pdf/2411.03346
* https://github.com/AutoCodeRoverSG/auto-code-rover

Author: Marti2203