Worked on the geerlingguy/linux repository to address a critical memory safety issue in the s390 IOMMU driver, focusing on kernel stability for virtualization and enterprise environments. Applied expertise in C programming, device driver development, and kernel internals to implement a targeted fix that ensures zpci_get_iommu_ctrs returns NULL for identity domains, thereby preventing invalid memory access and potential memory corruption. This patch reduced the risk of system instability during hardware passthrough and virtualization workloads. The work demonstrated a precise approach to kernel bug resolution, emphasizing reliability and maintainability in low-level system components without introducing new features during the period.