CVE-2023-53856

Summary

In the Linux kernel, the following vulnerability has been resolved:

of: overlay: Call of_changeset_init() early

When of_overlay_fdt_apply() fails, the changeset may be partially applied, and the caller is still expected to call of_overlay_remove() to clean up this partial state.

However, of_overlay_apply() calls of_resolve_phandles() before init_overlay_changeset(). Hence if the overlay fails to apply due to an unresolved symbol, the overlay_changeset.cset.entries list is still uninitialized, and cleanup will crash with a NULL-pointer dereference in overlay_removal_is_ok().

Fix this by moving the call to of_changeset_init() from init_overlay_changeset() to of_overlay_fdt_apply(), where all other early initialization is done.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/01bb96ad38089f5cc6de7746dac13437d35eb1dc
• https://git.kernel.org/stable/c/3fb210cd521c9efcb211e9f5ce40fc907200bf13
• https://git.kernel.org/stable/c/be86241bf5d1efd16d8a7231c13b33459c5d755d
• https://git.kernel.org/stable/c/c403c81b577a67fe9ec6a2e89d143256487be50f
• https://git.kernel.org/stable/c/a9515ff4fb142b690a0d2b58782b15903b990dba

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