Refcount Leak in Realtek RTL irqchip of Linux Kernel

CVE-2022-49714

Summary

A vulnerability within the Linux kernel's Realtek RTL irqchip has been identified, resulting from a failure to properly manage reference counts in the function map_interrupts. The of_find_node_by_phandle() function increments the reference count of returned node pointers, requiring a corresponding call to of_node_put() when the pointers are no longer needed. This vulnerability arises as the error path does not appropriately call of_node_put(), potentially leading to resource leakage and affecting overall system stability. The implementation has been revised to ensure correct reference count management for both normal and error paths.

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