Properly link new fs rules into the tree

CVE-2024-35960

Summary

In the Linux kernel, a significant linking bug has been identified within the rule management system of the network component. This issue arises when newly created rules are not properly linked into the internal tree structure, leading to a scenario where duplicated references to rules can result in a crash. Specifically, the function handling rule additions fails to adequately manage new rules that lack a parent, causing them to remain unlinked. The resulting behavior leads to critical instability, as the deletion routine assumes all nodes have valid parent references, which is not the case with these improperly linked rules. A recent patch has addressed this issue by ensuring that new rules are correctly initialized and linked, thereby preventing potential crashes and maintaining system integrity.

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